AKC got back to me! Within 24 hours too. I had sent an email to the Secretary, and she referred my request to their Archivist. She looked into the library and said their copy had been "deaccessioned". I had to look that word up. See! I can admit I don't know everything. She's going to look some more and said she'd get back to me if she finds anything. Still, thrilled they responded!
I couldn't find a web site belonging to Mary Lou either. Haven't been able to find a scanned PDF or anything else yet either. @tanza, thanks for posting on FB and for the info on the other two books that were recommended. Much appreciated!
The primary reason I'm after Mary Lou's book is that I recall @Zande mentioning that it had a good section in it that talked about colors. And went on to detail what a breeder would get breeding R/W to Tri, Tri to Brindle, B/W, to R/W and so on. It's more to satisfy my curiosity than anything else. Elspet Ford got into it a little bit in her book The Complete Basenji, which I have.
I'll keep looking. If I find it... I wonder what the copy right laws are on reproducing it? Not for profit or sale, but for prosperity. Don't know.