Back in the late 1960"s-early 1970"s I worked part time for Bell Tractor at Milo,MO whom was the MM dealer..
Somewhere I have a late 1960"s inventory sheet of new tractors and combines for lots of the MM dealers across the US..
Some dealers in this area were the following..
Bell Tractor Milo,MO
General Irrigation Carthage,MO
Ken Carter Harrisonville,MO
?? Ft Scott,KS Emmersons Hammond,KS