Susquehanna County's public library and historical society. Locations: Montrose, Forest City, Susquehanna and Hallstead-Great Bend. The mission of the Susquehanna County Historical Society and Free Library Association is to support the appreciation and preservation of local history, and to nourish the joy of reading, the discovery of ideas, and the power of information. To support the appreciation and preservation of local history, and to nourish the joy of reading, the discovery of ideas, and the power of information.