I'm looking for U.S. county-level land area (sq. miles) per 1990's. The U.S. Census provides gazetteer files for 1990, 2000, and 2010. I need data from 1950-1980. Where can I find this data?
This is what the gaetteer files look like:
fips land_sqmi
<chr> <dbl>
1 01001 594.436
2 01003 1589.784
3 01005 884.876
4 01007 622.582
5 01009 644.776
6 01011 622.805
7 01013 776.829
8 01015 605.868
9 01017 596.531
10 01019 553.700