Interstate 68 (English Wikipedia)

Maryland State Highway Administration. Alternate Route to Ohio and Points West (Highway sign). Washington County: Maryland State Highway Administration. Archived from the original on March 26, 2009. Retrieved January 17, 2009.

arc.gov (Global: low place; English: low place)

Wilbur Smith Associates (July 1998). "Highway and Traffic Analysis" (PDF). ADHS Economic Evaluation. Appalachian Regional Commission. p. 11. Archived from the original (PDF) on April 7, 2009. Retrieved April 11, 2009.
Appalachian Regional Commission (2007). "Highway Program". Appalachian Regional Commission. Archived from the original on January 17, 2009. Retrieved January 17, 2009.

books.google.com (Global: 3^rd place; English: 3^rd place)

Raitz, Karl & Thomson, George (1996). The National Road. Baltimore: Johns Hopkins University Press. p. 131. ISBN 978-0-8018-5155-1. Retrieved October 11, 2008 – via Google Books.

cnn.com (Global: 28^th place; English: 26^th place)

"85-Vehicle Pileup Kills Two in Western Maryland". CNN. May 23, 2003. Archived from the original on April 25, 2009. Retrieved January 17, 2009.

dot.gov (Global: 1,690^th place; English: 998^th place)

fhwa.dot.gov

Starks, Edward (January 27, 2022). "Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways". FHWA Route Log and Finder List. Federal Highway Administration. Archived from the original on September 20, 2023. Retrieved January 3, 2024.
Bezis, Jason & Noyes, Kristin (November 5, 2008). "Economic Development History of I-68 in Maryland". Federal Highway Administration. Retrieved January 17, 2009.{{cite web}}: CS1 maint: deprecated archival service (link)
Longfellow, Rickie (June 27, 2017). "Back in Time: Sideling Hill Mountain, I-68—Are We Going Over It or Around It?". General Highway History. Federal Highway Administration. Archived from the original on June 5, 2023. Retrieved June 5, 2023.

herald-mail.com (Global: low place; English: low place)

"Fog Warning System Installed on I-68". The Herald-Mail. Hagerstown, MD. July 3, 2005. Archived from the original on May 23, 2011. Retrieved January 17, 2009.

maps.google.com (Global: 2,258^th place; English: 1,630^th place)

"I-68 in West Virginia" (Map). Google Maps. Retrieved August 1, 2008.
"Topographic Map of Interstate 68 in Western Allegany County" (Map). Google Maps. Retrieved February 15, 2009.

maryland.gov (Global: 2,659^th place; English: 1,407^th place)

msa.maryland.gov

Maryland State Highway Administration (August 2, 1991). "Building the National Freeway" (PDF). Maryland Roads. Maryland State Highway Administration: 5. Archived (PDF) from the original on December 13, 2014. Retrieved December 12, 2014.

roads.maryland.gov

Highway Information Services Division (December 31, 2013). Highway Location Reference. Maryland State Highway Administration. Retrieved January 21, 2010.
- Garrett County (PDF).
apps.roads.maryland.gov
- Maryland State Highway Administration (2006). "Traffic Control Devices Design Manual" (PDF). Maryland State Highway Administration. Archived from the original (PDF) on January 13, 2014. Retrieved February 4, 2009.

md.gov (Global: low place; English: 8,337^th place)

mgs.md.gov

Brezinski, David (1994). "Geology of the Sideling Hill Road Cut". Maryland Geological Society. Archived from the original on July 13, 2012. Retrieved January 17, 2009.

mdhighwaycentennial.com (Global: low place; English: low place)

Maryland State Roads Commission (1960). Map of Maryland (Map). c. 1:380,160. Annapolis: Maryland State Roads Commission. Archived from the original on February 5, 2009. Retrieved February 4, 2009.

measuringworth.com (Global: 2,465^th place; English: 1,383^rd place)

Johnston, Louis; Williamson, Samuel H. (2023). "What Was the U.S. GDP Then?". MeasuringWorth. Retrieved November 30, 2023. United States Gross Domestic Product deflator figures follow the MeasuringWorth series.

news-register.net (Global: low place; English: low place)

Limann, Art (August 12, 2008). "Authority Won't Give Up on I-68 to Marshall". Wheeling News-Register. Archived from the original on July 16, 2011. Retrieved January 17, 2009.

nytimes.com (Global: 7^th place; English: 7^th place)

Wald, Matthew (June 18, 2003). "War on Road Fog Lacks Easy Solution". The New York Times. Archived from the original on April 3, 2015. Retrieved October 23, 2009.

post-gazette.com (Global: 569^th place; English: 354^th place)

Cleary, Caitlin (April 16, 2006). "If the Flood comes Too Soon, this Ark Won't Be Quite Ready". Pittsburgh Post-Gazette. Archived from the original on September 18, 2008. Retrieved April 16, 2006.

proquest.com (Global: 206^th place; English: 124^th place)

Shaffer, Ron (January 12, 1990). "Tunnel Visions". Washington Times. p. E1. ProQuest 307243358. Archived from the original on January 17, 2017. Retrieved July 6, 2017.
Castaneda, Ruben (June 2, 1991). "Gasoline Truck Overturns; Leak Ignites 8 Md. Houses; Three-Block Area Evacuated in Cumberland". Washington Post. p. B5. ProQuest 307444525. Archived from the original on January 17, 2017. Retrieved July 6, 2017.
"Cumberland Fire Damage". The Washington Post. June 3, 1991. p. D3. ProQuest 307400909. Archived from the original on January 17, 2017. Retrieved July 6, 2017.

times-news.com (Global: low place; English: low place)

Moses, Sarah (December 23, 2008). "Signs Alert Truck Drivers to Low Overpass in Ridgeley". Cumberland Times-News. Archived from the original on December 26, 2008. Retrieved January 17, 2009.

transportation.org (Global: low place; English: low place)

sp.route.transportation.org

Special Committee on U.S. Route Numbering (June 7, 1989). "Report of the Special Committee on U.S. Route Numbering to the Executive Committee" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 4. Archived from the original (PDF) on October 16, 2017. Retrieved January 17, 2009.
Special Committee on U.S. Route Numbering (November 5, 2002). "Report of the Special Committee on U.S. Route Numbering to the Standing Committee on Highways" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 8. Archived from the original (PDF) on October 16, 2017. Retrieved February 4, 2009.

washingtonpost.com (Global: 34^th place; English: 27^th place)

Beyers, Dan (September 8, 1992). "Mountain Road of Promise Slow to Lift Fortunes". The Washington Post. p. D1. Archived from the original on August 22, 2016. Retrieved July 22, 2016.

web.archive.org (Global: 1^st place; English: 1^st place)

Starks, Edward (January 27, 2022). "Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways". FHWA Route Log and Finder List. Federal Highway Administration. Archived from the original on September 20, 2023. Retrieved January 3, 2024.
Wilbur Smith Associates (July 1998). "Highway and Traffic Analysis" (PDF). ADHS Economic Evaluation. Appalachian Regional Commission. p. 11. Archived from the original (PDF) on April 7, 2009. Retrieved April 11, 2009.
Maryland State Highway Administration (August 2, 1991). "Building the National Freeway" (PDF). Maryland Roads. Maryland State Highway Administration: 5. Archived (PDF) from the original on December 13, 2014. Retrieved December 12, 2014.
Maryland State Roads Commission (1960). Map of Maryland (Map). c. 1:380,160. Annapolis: Maryland State Roads Commission. Archived from the original on February 5, 2009. Retrieved February 4, 2009.
Appalachian Regional Commission (2007). "Highway Program". Appalachian Regional Commission. Archived from the original on January 17, 2009. Retrieved January 17, 2009.
"I-68 Extension Gets Important Federal Endorsement". Steubenville, OH: WTOV-TV. September 9, 2003. Archived from the original on March 22, 2012. Retrieved January 17, 2009.
Shaffer, Ron (January 12, 1990). "Tunnel Visions". Washington Times. p. E1. ProQuest 307243358. Archived from the original on January 17, 2017. Retrieved July 6, 2017.
Special Committee on U.S. Route Numbering (June 7, 1989). "Report of the Special Committee on U.S. Route Numbering to the Executive Committee" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 4. Archived from the original (PDF) on October 16, 2017. Retrieved January 17, 2009.
Special Committee on U.S. Route Numbering (November 5, 2002). "Report of the Special Committee on U.S. Route Numbering to the Standing Committee on Highways" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 8. Archived from the original (PDF) on October 16, 2017. Retrieved February 4, 2009.
Bureau of Public Roads & American Association of State Highway Officials (November 11, 1926). United States System of Highways Adopted for Uniform Marking by the American Association of State Highway Officials (Map). 1:7,000,000. Washington, DC: United States Geological Survey. OCLC 32889555. Archived from the original on April 13, 2017. Retrieved November 7, 2013 – via Wikimedia Commons.
Castaneda, Ruben (June 2, 1991). "Gasoline Truck Overturns; Leak Ignites 8 Md. Houses; Three-Block Area Evacuated in Cumberland". Washington Post. p. B5. ProQuest 307444525. Archived from the original on January 17, 2017. Retrieved July 6, 2017.
"Cumberland Fire Damage". The Washington Post. June 3, 1991. p. D3. ProQuest 307400909. Archived from the original on January 17, 2017. Retrieved July 6, 2017.
"85-Vehicle Pileup Kills Two in Western Maryland". CNN. May 23, 2003. Archived from the original on April 25, 2009. Retrieved January 17, 2009.
Wald, Matthew (June 18, 2003). "War on Road Fog Lacks Easy Solution". The New York Times. Archived from the original on April 3, 2015. Retrieved October 23, 2009.
"Fog Warning System Installed on I-68". The Herald-Mail. Hagerstown, MD. July 3, 2005. Archived from the original on May 23, 2011. Retrieved January 17, 2009.
Beyers, Dan (September 8, 1992). "Mountain Road of Promise Slow to Lift Fortunes". The Washington Post. p. D1. Archived from the original on August 22, 2016. Retrieved July 22, 2016.
Melling, Carol (October 31, 2003). "I-68 Extension Now Eligible for Federal Funding" (Press release). West Virginia Department of Transportation. Archived from the original on May 23, 2009. Retrieved January 17, 2009.
Limann, Art (August 12, 2008). "Authority Won't Give Up on I-68 to Marshall". Wheeling News-Register. Archived from the original on July 16, 2011. Retrieved January 17, 2009.
Fluharty, Nate (September 15, 2014). "Plans Moving Forward for Moundsville-to-Morgantown Highway". Wheeling, WV: WTRF-TV. Archived from the original on September 16, 2014. Retrieved September 16, 2014.
Swint, Howard (October 5, 2019). "Howard Swint: I-68 extension lynch pin for W.Va. development". Charleston Gazette-Mail. Archived from the original on June 9, 2021. Retrieved March 26, 2022.
Maryland State Highway Administration (2006). "Traffic Control Devices Design Manual" (PDF). Maryland State Highway Administration. Archived from the original (PDF) on January 13, 2014. Retrieved February 4, 2009.
Longfellow, Rickie (June 27, 2017). "Back in Time: Sideling Hill Mountain, I-68—Are We Going Over It or Around It?". General Highway History. Federal Highway Administration. Archived from the original on June 5, 2023. Retrieved June 5, 2023.
Maryland State Highway Administration. Alternate Route to Ohio and Points West (Highway sign). Washington County: Maryland State Highway Administration. Archived from the original on March 26, 2009. Retrieved January 17, 2009.
West Virginia Department of Transportation Program Planning and Administration Division (2008). General Highway Map: Monongalia County (PDF) (Map). 1:63,360. Charleston: West Virginia Department of Transportation. Sheet 2. Archived from the original on April 25, 2012. Retrieved September 11, 2009.{{cite map}}: CS1 maint: bot: original URL status unknown (link)
West Virginia Department of Transportation (2007). Interstate System Average Daily Traffic: I-68 Morgantown to Maryland (PDF) (Report). West Virginia Department of Transportation. Archived from the original (PDF) on March 5, 2016. Retrieved January 12, 2016.
Cleary, Caitlin (April 16, 2006). "If the Flood comes Too Soon, this Ark Won't Be Quite Ready". Pittsburgh Post-Gazette. Archived from the original on September 18, 2008. Retrieved April 16, 2006.
Moses, Sarah (December 23, 2008). "Signs Alert Truck Drivers to Low Overpass in Ridgeley". Cumberland Times-News. Archived from the original on December 26, 2008. Retrieved January 17, 2009.
Brezinski, David (1994). "Geology of the Sideling Hill Road Cut". Maryland Geological Society. Archived from the original on July 13, 2012. Retrieved January 17, 2009.
West Virginia Department of Transportation Program Planning and Administration Division (2008). General Highway Map: Preston County (PDF) (Map). 1:63,360. Charleston: West Virginia Department of Transportation Program. Sheet 1. Archived (PDF) from the original on April 27, 2019. Retrieved September 11, 2009.

wikimedia.org (Global: low place; English: low place)

commons.wikimedia.org

Bureau of Public Roads & American Association of State Highway Officials (November 11, 1926). United States System of Highways Adopted for Uniform Marking by the American Association of State Highway Officials (Map). 1:7,000,000. Washington, DC: United States Geological Survey. OCLC 32889555. Archived from the original on April 13, 2017. Retrieved November 7, 2013 – via Wikimedia Commons.

worldcat.org (Global: 5^th place; English: 5^th place)

search.worldcat.org

Bureau of Public Roads & American Association of State Highway Officials (November 11, 1926). United States System of Highways Adopted for Uniform Marking by the American Association of State Highway Officials (Map). 1:7,000,000. Washington, DC: United States Geological Survey. OCLC 32889555. Archived from the original on April 13, 2017. Retrieved November 7, 2013 – via Wikimedia Commons.

wtov9.com (Global: low place; English: low place)

"I-68 Extension Gets Important Federal Endorsement". Steubenville, OH: WTOV-TV. September 9, 2003. Archived from the original on March 22, 2012. Retrieved January 17, 2009.

wtrf.com (Global: low place; English: low place)

Fluharty, Nate (September 15, 2014). "Plans Moving Forward for Moundsville-to-Morgantown Highway". Wheeling, WV: WTRF-TV. Archived from the original on September 16, 2014. Retrieved September 16, 2014.

wv.gov (Global: low place; English: 9,545^th place)

transportation.wv.gov

West Virginia Department of Transportation (2007). Interstate System Average Daily Traffic: I-68 Morgantown to Maryland (PDF) (Report). West Virginia Department of Transportation. Archived from the original (PDF) on March 5, 2016. Retrieved January 12, 2016.

gis.transportation.wv.gov

West Virginia Department of Transportation Program Planning and Administration Division (2008). General Highway Map: Preston County (PDF) (Map). 1:63,360. Charleston: West Virginia Department of Transportation Program. Sheet 1. Archived (PDF) from the original on April 27, 2019. Retrieved September 11, 2009.

wvdot.com (Global: low place; English: low place)

Melling, Carol (October 31, 2003). "I-68 Extension Now Eligible for Federal Funding" (Press release). West Virginia Department of Transportation. Archived from the original on May 23, 2009. Retrieved January 17, 2009.

wvgazettemail.com (Global: low place; English: 6,816^th place)

Swint, Howard (October 5, 2019). "Howard Swint: I-68 extension lynch pin for W.Va. development". Charleston Gazette-Mail. Archived from the original on June 9, 2021. Retrieved March 26, 2022.

Interstate 68 (English Wikipedia)

aaroads.com (Global: low place; English: low place)

arc.gov (Global: low place; English: low place)

books.google.com (Global: 3rd place; English: 3rd place)

cnn.com (Global: 28th place; English: 26th place)

dot.gov (Global: 1,690th place; English: 998th place)

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herald-mail.com (Global: low place; English: low place)

maps.google.com (Global: 2,258th place; English: 1,630th place)

maryland.gov (Global: 2,659th place; English: 1,407th place)

msa.maryland.gov

roads.maryland.gov

apps.roads.maryland.gov

md.gov (Global: low place; English: 8,337th place)

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mdhighwaycentennial.com (Global: low place; English: low place)

measuringworth.com (Global: 2,465th place; English: 1,383rd place)

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nytimes.com (Global: 7th place; English: 7th place)

post-gazette.com (Global: 569th place; English: 354th place)

proquest.com (Global: 206th place; English: 124th place)

times-news.com (Global: low place; English: low place)

transportation.org (Global: low place; English: low place)

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washingtonpost.com (Global: 34th place; English: 27th place)

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measuringworth.com (Global: 2,465^th place; English: 1,383^rd place)

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post-gazette.com (Global: 569^th place; English: 354^th place)

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