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Federal
Digital Data Sets of Depth-Duration Frequency of Precipitation for Oklahoma, USGS OFR 99-463.
Department of the Interior —
This data set consists of digital county boundaries for Oklahoma. The boundaries were derived from U.S. Geological Survey 1:100,000-scale Digital Line Graph data... -
Federal
County Boundaries for Selected Items from the Census of Agriculture, 1950-2012 (COA_STCOFIPS)
Department of the Interior —
This polygon shapefile provides county or county-equivalent boundaries for the conterminous United States and was created specifically for use with the data tables...