I was gifted "Maintaining Small-Farm Equipment" by S&A Larkin Hansen ('Storey Basics Series' of books). Not impressed & it actually annoyed me: it's padded out with superfluous sub-idiot advice. For example:
"Springs. Springs hold parts together in a number of ways ......"
"Wheels & shafts. Wheels come in all shapes and sizes ....."
"Bearings & Bushings. When metal moves against metal, it binds and grinds ....."
Very annoying: its 108 pages could probably be condensed down to a very thin pamphlet of useful tips. If you should come across it in your searches, I would recommend you continue searching!
[Edit] After-thought: a combination of the tractor's manual, youtube and asking questions on TAS (other forums available) probably the best option - which, pointer, means you might need to think of some other gift option!