TY - RPRT TI - Hydrogeology and sources of water to select springs in Black Canyon, south of Hoover Dam, Lake Mead National Recreation Area, Nevada and Arizona AU - Michael J. Moran AU - Jon W. Wilson AU - L. Sue Beard PY - 2015 DO - 10.3133/sir20155130 UR - https://pubs.usgs.gov/publication/sir20155130 ID - sir20155130 ER -