Enhanced Historical Land-Use and Land-Cover Data Sets of the U.S. Geological Survey: raster format files
This data set depicts land use and land cover from the 1970s and 1980s and has 
been previously published by the U.S. Geological Survey (USGS) in other file 
formats. This version has been reformatted to other file formats and includes 
minor edits applied by the U.S.  Environmental Protection Agency (USEPA) 
and USGS …