I just got some new reference material. Google Books used to have online previews of these with about fifty percent of each book available but they recently took them down, so I went looking and found these used editions for a reasonable price and in good condition, they may have been library reverence books. If any modders want some information from these books feel free PM me about it.
I intend to eventually get the 1989 first edition and the 2006 fifth edition.