00558nam 2200157z- 450 9910712881303321(CKB)5470000002497367(EXLCZ)99547000000249736720230509c1976uuuu -u- -engOperation and maintenance of a deep-well water-level measurement device, the Iron HorseDenver, Colorado?U.S. Geological SurveyBOOK9910712881303321Operation and maintenance of a deep-well water-level measurement device, the Iron Horse3303993UNINA