They may be of great interest to a collector. The book is in good condition for that old a book. It does look old, but all the pages are intact. Unfortunately it has been in a library reference section at some time and has library markings on the spine. A 1928 Putnam's Nature Field Book, William Thomas' Field Book of Common Gilled Mushrooms.
Paper is old but book is completely intact.
Excellent condition, dust jacket still in good condition. Cover discolored, but entire book is intact. The Observer's Book of Common Fungi, E. M. Wakefield. Small hardbound field guide with dust cover. I have listed these prices as a guide to what the books are worth, not necessarily as the minimum price for which the club will sell the book.