TY - RPRT TI - Mapping the floor of Lake Mead (Nevada and Arizona): Preliminary discussion and GIS data release AU - David C. Twichell AU - VeeAnn A. Cross AU - Stephen D. Belew PY - 2003 DO - 10.3133/ofr03320 UR - https://pubs.usgs.gov/publication/ofr03320 ID - ofr03320 ER -