PDF files from the University of Tennessee Extension. These may not meet current codes for your area.
http://bioengr.ag.utk.edu/extension/extpubs/PlanList97.htm#Roof%20Framing%20and%20Truss%20Plans
(https://i1009.photobucket.com/albums/af219/countryplans/ag-tenn.jpg) (http://bioengr.ag.utk.edu/extension/extpubs/PlanList97.htm)
Thanks, John. I may need to build some of this stuff for my cows soon.
WOW! An absolute treasure!
I've found a number of these, maybe some duplicates -
North Dakota State University, barns and ag buildings (http://www.ag.ndsu.edu/extension-aben/buildingplans)
Iowa State University, Midwest Plan Service (http://www-mwps.sws.iastate.edu/catalog/construction-farm)