I just found this terrific book (158 pages) about collecting Jazz LPs. It was written by a long-time collector who has spent many years looking through record shows, garage/estate sales, thrift shops, and many boxes of LPs in various houses, garages, and other storage sites. The wisdom he has gained over this long experience is documented in the book. I have collected Jazz LPs for many years and find this book very enlightening, documenting many of the experiences I have had, and adding some things that are new to me. Of all the books on jazz I have read I would put this right at the top of the list.
The title of the book is "Jazz On The Cheap: Reviews, Controversies, and Miscellaneous Musings About Jazz Records". The author and publisher is Lynn McCutcheon. He sells the book for $10 including U.S. postage. His email address is najp@embarqmail.com