1. Geologic reconnaissance map of headwater region of Gulkana and Susitna Rivers, Alaska / U.S Creator: Geological Survey (U.S.) Published / Created: 1912 Call Number: 848 G95 1912 Container / Volume: BRBL_00632 Image Count: 1 Resource Type: Maps, Atlases & Globes Found in: Beinecke Rare Book and Manuscript Library > Geologic reconnaissance map of headwater region of Gulkana and Susitna Rivers, Alaska / U.S. Geological Survey. Alfred H. Brooks, geologist in charge of division, topography and triangulation by D.C. Witherspoon, C.E. Giffin and J.W. Bagley.