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by United States. Science and Education Administration.;
Year: [1978], Callno: 631.52(73) UNI [P]
Book
by United States Dept. of Agriculture.;
Year: 1981., Callno: 636.4.082.2 GUI [Q]
Book
by United States Dept. of Agriculture.; United States Soil Conservation Service.;
Year: 1973., Callno: 631.459:631.61 CON
Book