698-067ef3 1977 Gen ESTADOS UNIDOS - SUELOS. 1977. General soil map. Orange and western part of Riverside counties, California. /Washington, D.C./ U.S. Department of Agriculture, 1977. Color. 51 x 61 cm. Escala 1:126 270. A la cabeza del título: U.S. Department of Agriculture. Soil Conservation Service. University of California. Agricultural Experiment Station.