These three books are in fine condition. No markings, tears or dog ears. The Unknown Craftsman is hardcover with original clear dust cover. Amazon list a paperback edition from about $96 to $123 The Potter's Challenge by Bernard Leach has original dust cover. I've seen $199 listed on Amazon. Pioneer Pottery by Michael Cardew is softcover edition. I've seen this listed for about $174. If you are a professional potter or represent a pottery association, we could come to a negotiated arrangement for these books.