Hi Rob,
A: In a secondhand bookshop / bookstore?

B: On my shelf (sorry, it's not leaving there - it's too useful.

) The full details are "World War One Survivors", by Ray Rimell, Published by Aston, 1990, Dist Motorbooks in the USA. ISBN 0946627444. Try
www.abebooks.com It was a 16.95 (Sterling) hardback in the UK.
It's a great idea. Bear in mind it is rather like cataloguing (a very rough guess) 40% of ALL the W.W.II a/c, and 1950s a/c for the directory. - That's a LOT of airplanes!
I'd not worry about dividing up replicas / originals etc. Stick to full size, and catalogue them as far as you can, noting their status as replica, etc.
Go for it!