TY - RPRT TI - Measurements of sand thicknesses in Grand Canyon, Arizona, and a conceptual model for characterizing changes in sand-bar volume through time and space AU - David M. Rubin AU - Roberto J. Anima AU - Rex Sanders PY - 1994 DO - 10.3133/ofr94597 UR - https://pubs.usgs.gov/publication/ofr94597 ID - ofr94597 ER -