1. Map of central and eastern Montana showing major geologic structures [cartographic material Creator: Montana. State Bureau of Mines and Metallurgy Published / Created: 1921 Call Number: 831ca 1921A Container / Volume: BRBL_00581 Image Count: 1 Resource Type: Maps, Atlases & Globes Found in: Beinecke Rare Book and Manuscript Library > Map of central and eastern Montana showing major geologic structures [cartographic material] / Montana State Bureau of Mines.