31. United States showing routes of principal explorers and early roads and highways [map] / from data Creator: Berthrong, I. P Published / Created: 1908 Call Number: 75j 1908 Container / Volume: BRBL_00414A Image Count: 1 Resource Type: Maps, Atlases & Globes Found in: Beinecke Rare Book and Manuscript Library > United States showing routes of principal explorers and early roads and highways [map] / from data prepared by Frank Bond ; by I. B. Berthrong.
32. Yellowstone National Park / compiled from the official records of the General Land Office, U.S Creator: Berthrong, I. P Published / Created: [1911] Call Number: 833fcm Y38 1911 Container / Volume: BRBL_00585 Image Count: 1 Resource Type: Maps, Atlases & Globes Found in: Beinecke Rare Book and Manuscript Library > Yellowstone National Park / compiled from the official records of the General Land Office, U.S. Geological Survey and other sources, under the direction of I.P. Berthrong, Chief of Drafting Division, G.L.O., 1911 ; compiled and drawn by I.P. Berthrong ; l