Theodore Judah (English Wikipedia)

Huffman, Wendell (1996). "Theodore Judah's Birthdate". cprr.org. Letters to the Editors, Railroad History, 175. Retrieved 21 October 2019.
King, R. Joe. “Nevada Survey Maps,” Central Pacific Railroad Photographic History Museum website. http://cprr.org/Museum/Maps/Nevada_Survey_Maps/. Retrieved September 13, 2022.
Galloway, John Debo (1941). "Theodore Dehone Judah--Railroad Pioneer". Civil Engineering. 11 (10 (Nov) and 11 (Dec)). Retrieved 21 October 2019.
Galloway, John Debo. "Locating the Central Pacific Railroad". cprr.org. Retrieved 21 October 2019. The reports by Judah give details of the location of the line up the Sierra Nevada, based upon his preliminary survey. Later location surveys varied from the original location at a number of places, but the line as built followed his first selection of the ridge between the Yuba and Bear rivers on the north and the North Fork of the American River. The route down the Truckee to the Big Bend at Wadsworth was also followed and it remains today the line of the Southern Pacific eastward from California.

fcusd.org

"Theodore Judah Elementary / Homepage". Archived from the original on 2016-11-30. Retrieved 2016-10-30.

Rogers, J. David; Spinks, Charles R. (May 6, 2019). "Theodore Judah and the blazing of the first transcontinental railroad over the Sierra Nevada" (PDF). mst.edu. Sacramento, CA: ASCE Golden Spike 150th Anniversary History Symposium. Retrieved 21 October 2019.

Noble, Doug (November 2010). "The Sacramento Valley Railroad: The first railroad of the West". Mountain Democrat. Placerville, California. Retrieved 9 May 2019.

Putnam, John Rose (June 12, 2011). "Crazy Judah and California's first railroad". mygoldrushtales.com. Retrieved 19 October 2019.

Gorman, Richard. “An Early Nevada City Odd Fellow,” October, 2017. https://www.nevadacityoddfellows.com/history/charlesmarsh/. Retrieved September 13, 2022.

"Theodore Dehone Judah". rpi.edu. Alumni Hall of Fame. September 2001. Retrieved 21 October 2019. Student in 1837

Judah, T. D. (1 January 1857). "A practical plan for building The Pacific Railroad". Virtual museum of the City of San Francisco. H. Porkinhorn, Washington DC. Retrieved 21 October 2019.

"Central Pacific Railroad: proposed alignment (10 October 1861)". Stanford Digital Repository. 1861. Retrieved 21 November 2019. [1] From Barmore Station to Clipper Gap -- [2] From Rattlesnake Bluffs to summit of Sierra Nevada -- [3] From summit of Sierra Nevada to Truckee River -- [4] From Dutch Flat to Rattlesnake Bluffs

Debbie Hollingsworth and Chuck Spinks. (3 April 2019). "The First Transcontinental Railroad". The First Transcontinental Railroad - Spotlight at Stanford. Retrieved 14 December 2020.

"CALIFORNIA'S FIRST RAILROAD". cdnc.ucr.edu. Sacramento Daily Union, Volume 160, Number 44. 13 August 1911. based on an 1880 authority

"Theodore Judah's Golden Ring". uprrmuseum.org. Archived from the original on 22 October 2019. Retrieved 21 October 2019. Even though he had to leave his formal schooling behind at the age of 13, he had developed a passion for civil engineering and railroads.

"Theodore Judah's Golden Ring". uprrmuseum.org. Archived from the original on 22 October 2019. Retrieved 21 October 2019. Even though he had to leave his formal schooling behind at the age of 13, he had developed a passion for civil engineering and railroads.
"Golden Spike 150th Anniversary Historical Symposium". ASCE. 6 May 2019. Archived from the original on 28 March 2019. Retrieved 19 October 2019.
"Theodore Judah Elementary / Homepage". Archived from the original on 2016-11-30. Retrieved 2016-10-30.