2004. California Department of Forestry and Fire Protection (using data from BOR and DOC FMMP). In late 1996, the Dept of Conservation (DOC) surveyed state and federal agencies about the county boundary coverage they used. As a result, DOC ado... California. California Department Of Forestry and Fire Protection.
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1980. Geological Survey (U.S.). This polygon shapefile contains the 1980 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).
1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, and 1990. Geological Survey (U.S.). This polygon shapefile portrays the 1990 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).
2000. Geological Survey (U.S.). This polygon shapefile portrays the 2000 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).
2014. United States. Bureau of Transportation Statistics. This polygon shapefile contains United States county boundaries with political limits extracted from the U.S. Census Bureau's MAF/TIGER Database (M... United States. Bureau of Transportation Statistics.
Mitchell, S. Augustus (Samuel Augustus), 1792-1868. Relief shown by hachures. Insets: San Francisco. Scale [ca. 1:24,400] -- San Francisco Bay and vicinity. Shows settlements, railroads, rivers, etc.... S. Augustus Mitchell].
2000. This raster dataset represents the average yield for cowpea crops in tons per hectare. Croplands cover ~15 million km2 of the planet and provide th... University of Minnesota. Institute on the Environment.
2000. This raster dataset represents the agricultural census data quality for cowpea crop yields. Data quality categories include (0= missing, 0.25= coun... University of Minnesota. Institute on the Environment.
2000. This raster dataset represents the agricultural census data quality for harvested areas of cowpea crops. Data quality categories include (0= missin... University of Minnesota. Institute on the Environment.
2000. This raster dataset depicts the average fractional proportion of a gridcell for cowpea crops that were harvested circa 2000. Croplands cover ~15 mi... University of Minnesota. Institute on the Environment.