Got a couple flats of manuals today at auction.
First one (Overhauling 10-20 and 15-30 Tractors) Second was Instruction Book for McCormick-Deering Farmall Tractor Model F-12 third is Instruction Book for McCormick-Deering Farmall Tractor F-20 fourth is Instruction Book for 10-20 Gear Drive Tractor.
Got 10 manuals in this flat but they are similar to first four. Interesting part is several of them have (Preserve this book)printed on front and someone did just that. Several were printed in the early 1930's and one binder directions pamplet was printed in Dec of 1895.
So if you are overhauling your 10-20 or 15-30 I have the directions and will share. It pays to play nice as someone said on another thread. Photos from pamplet in flat.