TY - RPRT TI - Surficial geology, geomorphology, and erosion of archeologic sites along the Colorado River, eastern Grand Canyon, Grand Canyon National Park, Arizona AU - Richard Hereford AU - H.C. Fairley AU - K. S. Thompson AU - J.R. Balsom PY - 1993 DO - 10.3133/ofr93517 UR - https://pubs.usgs.gov/publication/ofr93517 ID - ofr93517 ER -