So if I understand correctly, the 4-volume set of big Greenberg manuals with the white covers that sells for $200 really doesn't contain additional information beyond the 700-page single volume I already have?
I should have also mentioned... Dennis Waldron who is a member here has occasionally shared repair tips and technical info related to the scale Hudsons. I'm not sure if he's ever published a book but if he did I would buy it! It's lesser-known information from "insiders" like Dennis that I'm especially seeking.