1978. United States. Soil Conservation Service. Base source: USGS 1:100,000 county base map dated 1976; interpretations derived from soil map constructed 1975.; "Projection and 10,000-metre grid ... Dept. of Agriculture, Soil Conservation Service (Washington.).
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1978. Projection: WGS72 Mercator Projection; Series: Defense Mapping Agency Nautical Charts. National Geospatial-Intelligence Agency.
1978. Levinson, David M. and Chen, Wei. High-quality GIS land use maps for the Twin Cities Metropolitan Area for 1978 that were developed from paper maps (no GIS version existed previousl...
1978. United States. Soil Conservation Service. Universal Transverse Mercator projection; 1927 North American datum.; Jan. 1978.; Indexed. 92 x 112 centimeters Scale 1:50,000. Dept. of Agriculture, Soil Conservation Service (Washington.).