"This book is one of twenty which comprise the complete, detailed manuscript which the author prepared for the Blue guide: Greece, the Aegean Islands (2010), and on which the Blue guide was based. Some of this text therefore appears in the Blue guide" -- t.p. verso.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Paros & Antiparos by Nigel McGilchrist. ISBN 9781907859045. Published by Genius Loci in 2010. Publication and catalogue information, links to buy online and reader comments.
