Distribution and Abundance of Nonnative Plant Species at Johnstown Flood National Memorial and Allegheny Portage Railroad National Historic SiteEphraim Zimmerman, National Park Service Staff · First published 2013Open the Tome
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
Ecosystem mediated occurrence and recruitment of northern red oak (Quercus rubra L.) in northern lower MichiganEphraim A. Zimmerman, University of Michigan. School of Natural Resources and Environment · First published 2003Open the Tome
