1 map in 21 sheets (14 plans, 7 profiles): col. ; 46 x 64 cm. Notes Relief shown by contours. Each sheet includes a key map. Surveys for individual sheets conducted 1919-23. Library has: Sheets I (2 copies), J, K, L, M, and N only. "Contour interval on land 50 feet." "Contour interval on river surface 5 feet." "Datum is mean sea level." "Mileage is measured from U. S. G. S. concrete gauge well opposite mouth of Paria River." "Topography by U. S. Reclamation Service." "Surveyed in 1919-23." Original publisher: U.S. Geological Survey, Scale: 1: 81,680.