TY  - RPRT
TI  - Changes in population and agricultural land in conterminous United States counties, 1790 to 1997
AU  - Pamela J. Waisanen
AU  - Norman B. Bliss
PY  - 2002
DO  - 10.1029/2001gb001843
UR  - https://pubs.usgs.gov/publication/70024196
ID  - 70024196
ER  -