Clouse, Jerry and Kate Kauffman. "Watt’s Folly." Pennsylvania Heritage 15:4 (Fall 1989): 12-18.
An article on Frederick Watts that discusses his life, his experimental farm, and his efforts in establishing the Pennsylvania Farmers High School
Ensminger, Robert F. The Pennsylvania Barn: Its Origin, Evolution, and Distribution in North America.. Baltimore, MD: Johns Hopkins University Press, 1992..
First comprehensive history of the Pennsylvania Barn from its origins in Switzerland through its distribution in the United States.
Van Dolsen, Nancy. Cumberland County: An Architectural Survey. Carlisle: Cumberland Country Historical Society, 1990.
Included within Chapter II, 1825-1900, of this book are pictures of the experimental farm including the tenant house, barn, and summer kitchen. Drawings of the floor plans of the house and barn as well as a diagram of the farm buildings are included. Limited background on Frederick Watts and his ideas for improvement are also listed.
University of Virginia Library has presents data on the population and economy of U.S. states and counties from 1790 to 1960 including a section on agriculture.
The Pennsylvania Rural History Project http://www.phmc.state.pa.us/bhp/AG_Context/context_resources.asp?secid...
This Pennsylvania Historical and Museum Commission site includes pictures of barns, links to other agricultural sites and can provide in-depth data on sites currently on the National Register of Historic Places.