Habitat availability and utilization by cavity-nesting birds and mammals in old growth timber, Cook Forest, Pennsylvania, 190 - 01 - 04 - LD1017 .C8133 1987 C3, Volume: Archives LD1017 .C8133 1987 C3; Volume: Carlson Library Level A Main Quarto Collection QL756 .C3. Clarion University Archives. http://buoy1.klnpa.org/repositories/2/resources/393 Accessed April 30, 2025.