United States. Forest Service. Northeastern Research Station & McWilliams, W. H. (2004). Annual inventory report for Pennsylvania's forests: Results from the first three years. U.S. Dept. of Agriculture, Forest Service, Northeastern Research Station.
Chicago Style (17th ed.) CitationUnited States. Forest Service. Northeastern Research Station and William H. McWilliams. Annual Inventory Report for Pennsylvania's Forests: Results from the First Three Years. Newtown Square, PA: U.S. Dept. of Agriculture, Forest Service, Northeastern Research Station, 2004.
MLA (9th ed.) CitationUnited States. Forest Service. Northeastern Research Station and William H. McWilliams. Annual Inventory Report for Pennsylvania's Forests: Results from the First Three Years. U.S. Dept. of Agriculture, Forest Service, Northeastern Research Station, 2004.