And you should also include Melrose Country Club in Philadelphia which was designed by Mackenzie and Maxwell over the site of a rudimentary existing course so effectively a totally new course (1926-28).
MacKenzie and Maxwell built 27 holes at Nichols Hills in Oklahoma City, 18 of which eventually became the Oklahoma City Golf and Country Club. The other nine became housing.
Neil:
I am sure you have seen the letter from MacKenzie to Maxwell in praise of Maxwell's work at Melrose.
My impression from that letter is that Maxwell had the contract prior to their partnership, and after they paired up it was a "MacKenzie and Maxwell project" but still entirely Maxwell's design. As far as I know, MacKenzie never set foot in Philadelphia until Melrose was finished. He did stop through Oklahoma City to visit Maxwell, but again, my impression is that was Maxwell's job from start to finish and MacKenzie's involvement was in name only.
Is that your impression, too, or do you have something more about them? If not, listing them as MacKenzie's is kind of a stretch.
Of course, this may be true of MacKenzie's work with Robert Hunter, as well, but we do know for certain that MacKenzie was on the ground for the most noteworthy of them.