Distribution and Abundance of Nonnative Plant Species at Johnstown Flood National Memorial and Allegheny Portage Railroad National Historic Site (Technical Report NPS/NER/NRTR?2007/083)

by: Ephraim Zimmerman · National Park Service Paperback details (USA). ISBN: 978-1-4921-6961-1 ISBN-10: 1-4921-6961-7 CreateSpace Independent Publishing Platform · 2013