OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
The 'Connoisseur's' guide to antique furniture : edited by L.G.G. Ramsey and Helen Comstock by L. G. G. Ramsey. ISBN 0718130626. Published by 'The Connoisseur' in 1969. Publication and catalogue information, links to buy online and reader comments.