Shows proposed routes for a transcontinental railroad.
From Memorial of Robert Mills, respecting a new route to the Pacific Ocean, with a plan for the transportation of dispatches to Astoria in fifteen days (Washington : publisher not identified, 1848).
Prime meridians: Greenwich and Washington.
"1. Sess. 30 Cong. Senate Mis. no. 51."
Notes (date):
This date is inferred.
Notes (citation):
Wheat, C.I. Maps of the California gold region, 1848-1857, 53