by
Nelson, Frank L. Published: U.S. Dept. of Agriculture, Soil Conservation Service ; in cooperation with U.S. Dept. of the Interior, Bureau of Indian Affairs, Arizona Agricultural Experiment Station, and California Agricultural Experiment Station, 1986
Description:
vii, 108 pages, 3 unnumbered pages, 27 folded pages of plates : illustrations, maps (some color) ; 28 cm.