1. Sketch showing the primary and secondary triangulation of 1873 / Department of the Interior, U.S Creator: Geological and Geographical Survey of the Territories (U.S.) Published / Created: 1873?] Call Number: 834bf 1873A Container / Volume: BRBL_00590 Image Count: 1 Resource Type: Maps, Atlases & Globes Found in: Beinecke Rare Book and Manuscript Library > Sketch showing the primary and secondary triangulation of 1873 / Department of the Interior, U.S. Geological and Geographical Survey of the Territories, F.V. Hayden, U.S. Geologist in Charge ; primary triangulation by Jas. T. Gardner ; secondary triangula