I have many of the above, and concur that Bill Quirin's Golf Courses of the MGA is an absolute gem. An interesting if short history of the group itself, then profiles, from several pages to summaries, of every MGA club, illustrated. Oversized and stylish.
You can find it online (eBay and AbeBooks) for $5 and up. There was only one printing, so everything is a first edition. If you don't have it, grab it.
Of all the others, Jim Finegan's Philly book is the largest. Not sure if the Philly phone book is as big. It has everything.