Forest statistics for Pennsylvania - 1978.

by Considine, Thomas J.
Broomall, Pa. : USDA Forest Service, Northeastern Forest Experiment Station, 1980

The timber resources of Pennsylvania,

by Ferguson, Roland H.
[Upper Darby, Pa.], [Northeastern Forest Experiment Station, U.S. Dept. of Agriculture], 1968

Forest statistics for Pennsylvania, 1978 and 1989 /

by Alerich, Carol L.
Radnor, PA : Northeastern Forest Experiment Station, USDA Forest Service, 1993

An analysis of Pennsylvania's forest resources /

by Powell, Douglas S.
Broomall, Pa. : U.S. Dept. of Agriculture, Forest Service, Northeastern Forest Experiment Station, 1982