Northwest trees :
identifying and understanding the region's native trees /
Stephen F. Arno & Ramona P. Hammerly.
APA Citation
Arno, S. F., Hammerly, R. P. (2007). Northwest trees: identifying and understanding the region's native trees. Anniversary ed., rev. ed. Seattle, WA: Mountaineers Books.
MLA Citation
Arno, Stephen F, and Ramona P Hammerly. Northwest Trees: Identifying And Understanding the Region's Native Trees. Anniversary ed., rev. ed. Seattle, WA: Mountaineers Books, 2007.
Warning: These citations may not always be complete (especially for serials).