ISBN 9781492804680 books & textbook
Biotic Inventory in the Schwoebel Tract at Valley Forge National Historical Park (Technical Report NPS/NER/NRTR?2006/068)
Yahner, Richard H. Kubel, Jacob E. Ross, Badley D. National Park Service
CreateSpace Independent Publishing Platform /2013-09-27 Paperback / 86 Pages
isbn-10: 1492804681 / isbn-13: 9781492804680
