Vegetation Classification and Mapping at Allegheny Portage Railroad National Historic SiteStephanie Perles, Gregory Podniesinski, Ephraim Zimmerman, Elizabeth Eastman, Lesley Sneddon · First published 2013Open the Tome
GyaehlingaayCarol M. Eastman, Elizabeth A. Edwards, Lillian Pettviel · First published 1989Open the Tome