There are enough comparable (successful) historical Ebay sales to suggest somewhere in the $20 range would sell.  I do believe I could make quick work of researching, listing, and shipping them, and be in a position to make money @ $20/each WHEN they sell.  Ebay offers X number of free listing per month.  Old paper does sell.  I buy plenty, and some cost me much more than I'd want to pay.
I'd be interested in paper on the following:
vintage electrical testing equipment
Ford 3610 tractor
Ford 555B tractor
Ford 1100 tractor
'Farmall Super A and/or attachments
'65 & '66 Ford F350
Sears V-Twin lawn tractor
gravely garden tractor or implements  
Thorsen, Wizard, NYE Tool, and Ridgid tool catalogs.
Best of luck.