Hereford, Richard, 1993, Entrenchment and widening of the upper San Pedro River, Arizona: Geological Society of America Special Paper 282, 46 p. Authors Hereford, Richard Publication Date 1993 Citation Geological Society of America Special Paper 282, 46 p. State AZ Province BR County CH Keywords Fluvial Geomorphology Climate Flood Floodplain Management Surface Water Hydrology More Keywords Fluvial Geomorphology, Climate, Flood, Floodplain Management, Surface Water, Hydrology, AzGeoBib RefNum 13870