If you get them from Jensales, or from New Holland, you have to buy a tractor manual, and loader and backhoe manuals. The Jensales manual is good, but make sure the tractor manual is the industrial tractor manual, there is a lot of overlap w/ the ag tractor manual, but some things like the torque convertor transmission is not in the ag book.
I have both the ag and industrial books, (ag from Ford, industrial from Jensales), and the tractor books are probably close to1600 pages. If you get the parts book, which is a good idea, it covers both.
Of course I know nothing about the Ebay one.
Good Luck