interchangable parts-parts manual

They are great aren't they. My oldest is an 8th edition and it is the the one that covers the 1920s. I have only seen two 8th editions and bought them both. My buddy with the local salvage has one of them so if anything ever happens we will have at least one between us. I am after a first edition if one ever shows up but I doubt my pockets will be deep enough. I also have most years of the foreign and the Eaton axle Hollander manuals also.
My furrin books only go back to 1955. I used to work in a large yard that was closing and relocating. The boss said to toss all the old Hollanders in the dumpster, so I backed the "dumpster" I was driving over to the door and loaded up. Downright incredible what you can learn from these, but as you stated, they don't cover everything. I've been contemplating the creation of a Mopar only interchange manual for years, but not sure how to go about it, since copying info from Hollander would be a no-no.