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1. Forest Inventory and Analysis (FIA) invasive plant data aggregated by U.S. county, 2005-2018 Data publication contains GIS data

Author(s):
Potter, Kevin M.; Riitters, Kurt H.

2. Historical woodland density of the conterminous United States, 1873 Data publication contains GIS data

Author(s):
Liknes, Greg C.; Nelson, Mark D.; Kaisershot, Daniel J.
https://www.fs.usda.gov/rds/archive/Catalog?keywords%5B0%5D=Ecology%2C+Ecosystems%2C+%26+Environment&keywords%5B2%5D=Resource+inventory&keywords%5B4%5D=environment&location%5B0%5D=conterminous+United+States&geotag=GIS+publications+only