Proceedings of a joint international symposium of the British Plant Gall Society and the Systematics Association held in London, England, 1992.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Plant galls : organisms, interactions, populations. ISBN 0198577699. Published by Clarendon Press in 1994. Publication and catalogue information, links to buy online and reader comments.
