Quantitative determination of the forest type at the McKeever Environmental Learning Center, Mercer County, Pennsylvania, 190 - 01 - 04 - LD1017 .C8133 1977 R4, Volume: Archives LD1017 .C8133 1977 R4; Volume: Carlson Library Level A Main Quarto Collection SD551.R4. Clarion University Archives.

Quantitative determination of the forest type at the McKeever Environmental Learning Center, Mercer County, Pennsylvania, 190 - 01 - 04 - LD1017 .C8133 1977 R4, Volume: Archives LD1017 .C8133 1977 R4; Volume: Carlson Library Level A Main Quarto Collection SD551.R4. Clarion University Archives. http://as-clarion.klnpa.org/repositories/2/resources/348 Accessed December 24, 2025.