1980. United States. Soil Conservation Service. Base source: USGS 1:100,000 county base dated 1979; interpretations derived from soil map constructed 1979.; "Projection and 10,000-metre grid tick... Dept. of Agriculture, Soil Conservation Service (Washington.).
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1978. United States. Soil Conservation Service. Base source: USGS 1:100,000 county base compiled in 1973; interpretations derived from soil map constructed 1972.; "Projection and 10,000-metre gri... Dept. of Agriculture, Soil Conservation Service (Washington.).
1989. United States. Soil Conservation Service. "May 1989 1004434."; Shows land use.; Includes vicinity map. 82 x 94 centimeters 1:50,000. The Service (Fort Worth, Tex.?).
1990. California. Farmland Mapping and Monitoring Program. This polygon shapefile represents areas of important farmland in Sierra Valley, California for 1990. Established in 1982, Government Code Section 6... California. Farmland Mapping and Monitoring Program.
1994. California. Farmland Mapping and Monitoring Program. This polygon shapefile represents areas of important farmland in Sierra Valley, California for 1994. Established in 1982, Government Code Section 6... California. Farmland Mapping and Monitoring Program.
1996. California. Farmland Mapping and Monitoring Program. This polygon shapefile represents areas of important farmland in Sierra Valley, California for 1996. Established in 1982, Government Code Section 6... California. Farmland Mapping and Monitoring Program.
1998. California. Farmland Mapping and Monitoring Program. This polygon shapefile represents areas of important farmland in Sierra Valley, California for 1998. Established in 1982, Government Code Section 6... California. Farmland Mapping and Monitoring Program.
2000. California. Farmland Mapping and Monitoring Program. This polygon shapefile represents areas of important farmland in Sierra Valley, California for 2000. Established in 1982, Government Code Section 6... California. Farmland Mapping and Monitoring Program.
2002. California. Farmland Mapping and Monitoring Program. This polygon shapefile represents areas of important farmland in Sierra Valley, California for 2002. Established in 1982, Government Code Section 6... California. Farmland Mapping and Monitoring Program.
2004. California. Farmland Mapping and Monitoring Program. This polygon shapefile represents areas of important farmland in Sierra Valley, California for 2004. Established in 1982, Government Code Section 6... California. Farmland Mapping and Monitoring Program.