U S Geological Survey Scientific Investigations Map : Isostatic gravity map with geology of the Santa Ana 30' x 60' minute quadrangle, southern California / by V.E. Langenheim ... [and others] ; geology compiled by D.M. Morton ; edited by Carolyn A. Donlin.
U S Geological Survey Water Supply Paper : Stream water quality in the conterminous United States--status and trends of selected indicators during the 1980's / by Richard A. Smith, Richard B. Alexander, and Kenneth J. Lanfear.
U S Imports History Dvd Rom : U.S. imports history : historical summary ... : international harmonized system commodity classification (HTSUSA) by country, by customs district / Foreign Trade Division.