It's hard to put a dollar value on something like that, but I'd certainly pay $25 for that stack, maybe even $50.
I have access to all of the service bulletins from 1965 through the 1990s through my local NH dealer, and I find myself going over there from time to time to look something up that cannot be found in a service manual. They are of high value to me, and I hope they never get thrown away.
