At the Kansas Flywheels Museum (old farm stuff) in Salina, upstairs there is a whole area with old literature including older Gleaner stuff. I think the earliest I found was stuff for the G, as well as F_K, F2_K2, l_M, and on up. Also some old AC tractor stuff like for the XT190. I never knew until I looked at the stuff that you could flip the cab on the G forward to haul it, and the K looks pretty funny with a 2 row corn head.