TY - RPRT TI - Numerical ages of Holocene tributary debris fans inferred from dissolution pitting on carbonate boulders in the Grand Canyon of Arizona AU - R. Hereford AU - K. S. Thompson AU - K. J. Burke PY - 2017 DO - 10.1006/qres.1998.1987 UR - https://pubs.usgs.gov/publication/70020774 ID - 70020774 ER -