1. Geoecology: County-Level Environmental Data for the United States, 1941-1981
  2. temporal
  3. 1977
  4. 01
  5. 01
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geoecology_R1.M03.txt
geoecology_R1.W09.txt
geoecology_R1.W10.zip
geoecology_R1.W10.txt