I'd appreciate opinions of anyone here about the new four volume set "Edison Diamond Disc Record Labels & Discography" by Charles Gregory. I ran across this set on Ebay being offered by the author. There is a good deal of work by Ray Wile included in the set. Mr Gregory tells me that 176 libraries in the US and Europe are using the text as a research tool. (IBN 0-9745432-0-9) I'm wondering if anyone has any experience with this work and what they think about it. Thanks, Bruce