Previous ed. : 1958.
v. 1. A-Lel
v. 2. Lem-Z.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
The international rhododendron register & checklist. ISBN 1902896505. Published by Royal Horticultural Society in 2004. Publication and catalogue information, links to buy online and reader comments.
