Centre County Historical Society: Includes historical articles, exhibits, preservation projects, kid's and teacher resources, and museum store.
Columbia County Historical and Genealogical Society: Includes information on resources available, memberships, hours of operation and location.
Greene County Historical Society and Museum: Includes hours of operation and overview of exhibits including its collection of Monongahela Culture artifacts, and Greensboro pottery.
Main Street Gettysburg: A local organization formed to ensure the historic integrity of the Gettysburg, PA area will be maintained.
Mifflin County Historical Society: Historical information including publications. Includes information on hours of operation, memberships and events.
The Historical Society of Pennsylvania: Preserving the history and heritage of Pennsylvania.