1. Geologic maps and cross sections showing configurations of bedrock surfaces, Broken Bow 1⁰ x 2⁰ quadrangle, east-central Nebraska [cartographic material] Yale Public content 2000. 2002-06-01T04:00:00Z. 2023-02-11T04:46:14Z. Geological Survey (U.S.). The Survey ; Information Services [distributor]. English. Public. Nebraska.