erc: who: Bendix Field Engineering Corporation. Grand Junction Operations. what: Aerial Radiometric and Magnetic Survey: Beeville/Bay City National Topographic Map, Texas Gulf Coast, Volume 2 when: 1979 where: https://digital.library.unt.edu/ark:/67531/metadc958337/ erc-support: who: University of North Texas Libraries what: Permanent: Stable Content: when: 20081203 where: https://digital.library.unt.edu/ark:/67531/