1979. United States. Soil Conservation Service. "Base map prepared by SCS, WTSC Carto Unit from AMS 1:250,000 series."; Sheet 1 has text on verso.; Includes location map. 59 x 89 centimeters Scal... Dept. of Agriculture, Soil Conservation Service (Fort Collins, Colo.).
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1979. United States. Soil Conservation Service. "Compiled by USGS from 1:24 000-scale topographic maps dated 1955-1969."; Partially revised from aerial photographs taken 1972-73. Map edited 1978.... Dept. of Agriculture, Soil Conservation Service (Fort Collins, Colo.).
1979. United States. Soil Conservation Service. "Compiled by USGS from 1:24,00-scale topographic maps dated 1972-1978. Partially revised from aerial photographs taken 1975. Map edited 1979."; "Pr... Dept. of Agriculture, Soil Conservation Service (Fort Collins, Colo.).
1984. California. Farmland Mapping and Monitoring Program. This polygon shapefile represents areas of important farmland in Imperial County, California for 1984. Established in 1982, Government Code Section... California. Farmland Mapping and Monitoring Program.
1986. California. Farmland Mapping and Monitoring Program. This polygon shapefile represents areas of important farmland in Imperial County, California for 1986. Established in 1982, Government Code Section... California. Farmland Mapping and Monitoring Program.
1988. California. Farmland Mapping and Monitoring Program. This polygon shapefile represents areas of important farmland in Imperial County, California for 1988. Established in 1982, Government Code Section... California. Farmland Mapping and Monitoring Program.
1990. California. Farmland Mapping and Monitoring Program. This polygon shapefile represents areas of important farmland in Imperial County, California for 1990. Established in 1982, Government Code Section... California. Farmland Mapping and Monitoring Program.
1992. California. Farmland Mapping and Monitoring Program. This polygon shapefile represents areas of important farmland in Imperial County, California for 1992. Established in 1982, Government Code Section... California. Farmland Mapping and Monitoring Program.
1994. California. Farmland Mapping and Monitoring Program. This polygon shapefile represents areas of important farmland in Imperial County, California for 1994. Established in 1982, Government Code Section... California. Farmland Mapping and Monitoring Program.
1996. California. Farmland Mapping and Monitoring Program. This polygon shapefile represents areas of important farmland in Imperial County, California for 1996. Established in 1982, Government Code Section... California. Farmland Mapping and Monitoring Program.