Not often I give a plug to the tractor magazine market but "Classic Tractor" (editor Rory Day used to be a board member) is well worth the purchase price this month. Has an extensive article on badge engineering which, although not about Fordson and Fords is an excellent read.
This mag is the best of the bunch as it does not carry the same stories as the others and covers the whole range of tractors old to new.
PS: Not getting paid for this recommendation nor am I part of the staff.