New Jersey Route 31 (English Wikipedia)

Acts of the Legislature of the State of New Jersey. New Jersey State Legislature. 1854. p. 434. Retrieved August 10, 2009. Pennington Turnpike.
Hood, John (1905). Index of colonial and state laws of New Jersey, between the years 1663 and 1903 inclusive. Sinnickson Chew & Sons Company. p. 1081. Retrieved August 10, 2009. Hopewell and Ewing Turnpike.
Annual report of the commissioner of public roads. New Jersey Commissioner of Public Roads. 1916. p. 53. Retrieved August 9, 2009. Spruce Run Turnpike.

books.google.com

Votes and proceedings of the ... General Assembly of the State of New Jersey. New Jersey General Assembly. c. 1835. Retrieved August 9, 2009.
Schmidt, Hubert Glasgow (1945). Rural Hunterdon. Rutgers University Press. p. 169. ISBN 0-8371-5765-X. Retrieved August 8, 2009.
Annual report of the Commissioner of Public Roads. New Jersey. Commissioner of Public Roads. 1898. Retrieved August 10, 2009.

"Award of Merit – Highway-Route 31 Dualization". New York Construction News. Retrieved December 11, 2008.

"Retire Route 69 Designation" (PDF). Hightstown Gazette. June 8, 1967. p. 4. Archived (PDF) from the original on February 25, 2019.

1927 New Jersey Road Map (Map). State of New Jersey. Archived from the original on October 31, 2007. Retrieved October 8, 2008.

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.

Newman, Andy (July 23, 1995). "Road and Rail: Truckers Carve a New Route, Crowding a Two-Lane Road". The New York Times. Retrieved December 11, 2008.

"Route 31 straight line diagram" (PDF). New Jersey Department of Transportation. Archived (PDF) from the original on September 4, 2022. Retrieved March 17, 2020.
"Route 202 straight line diagram" (PDF). New Jersey Department of Transportation. Archived (PDF) from the original on March 18, 2006. Retrieved December 8, 2008.
"Route 31 - Hunterdon County, New Jersey: Land Use and Transportation Plan". New Jersey Department of Transportation. 2005. Archived from the original on June 19, 2009. Retrieved September 14, 2009.
"Route 31, Integrated Land Use & Transportation Plan" (PDF). New Jersey Department of Transportation. 2008. Archived (PDF) from the original on October 18, 2012. Retrieved September 14, 2009.

"Route 31 straight line diagram" (PDF). New Jersey Department of Transportation. Archived (PDF) from the original on September 4, 2022. Retrieved March 17, 2020.
"Route 202 straight line diagram" (PDF). New Jersey Department of Transportation. Archived (PDF) from the original on March 18, 2006. Retrieved December 8, 2008.
Moraeski, Dan (2009). "Map of NJ Turnpikes" (PDF). Alps Roads. Archived (PDF) from the original on August 12, 2011. Retrieved August 10, 2009.
"1953 renumbering". New Jersey Department of Highways. Archived from the original on June 28, 2011. Retrieved July 31, 2009.
1927 New Jersey Road Map (Map). State of New Jersey. Archived from the original on October 31, 2007. Retrieved October 8, 2008.
"Retire Route 69 Designation" (PDF). Hightstown Gazette. June 8, 1967. p. 4. Archived (PDF) from the original on February 25, 2019.
"Route 31 - Hunterdon County, New Jersey: Land Use and Transportation Plan". New Jersey Department of Transportation. 2005. Archived from the original on June 19, 2009. Retrieved September 14, 2009.
"Route 31, Integrated Land Use & Transportation Plan" (PDF). New Jersey Department of Transportation. 2008. Archived (PDF) from the original on October 18, 2012. Retrieved September 14, 2009.

"1953 renumbering". New Jersey Department of Highways. Archived from the original on June 28, 2011. Retrieved July 31, 2009.