TY - RPRT TI - Isopach mapping by photogeologic methods as an aid in the location of swales and channels in the Monument Valley area, Arizona AU - Irving Jerome Witkind AU - W. R. Hemphill AU - C. L. Pillmore AU - R. H. Morris PY - 1960 DO - 10.3133/b1043d UR - https://pubs.usgs.gov/publication/b1043D ID - b1043D ER -