75. Bartholomew-Began, S. 1999. Additions to the bryoflora of Hawk Mountain Sanctuary, Berks County, Pennsylvania. Journal of the Pennsylvania Academy of Science 73(1):3-9. | Hawk Mountain Sanctuary: Learn Visit Join

75. Bartholomew-Began, S. 1999. Additions to the bryoflora of Hawk Mountain Sanctuary, Berks County, Pennsylvania. Journal of the Pennsylvania Academy of Science 73(1):3-9.

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