The Ralph Gregory Library and the records of the Four Rivers Genealogical Society are located in the museum's lower level.
The society is dedicated to promoting genealogical research, assisting members and others in researching and documenting their family histories.
Records are available on days the museum is open, from 1 p.m. to 4 p.m. On Tuesdays, the records are available from 10 a.m. to 4 p.m. The library is staffed by qualified genealogists during open hours.
The Ralph Gregory Library features books, manuscripts, microfilm and selected-original official county records owned by the genealogical society, as well as the Washington Historical Society.
It is the most comprehensive collection of reference material on Franklin County including donated family histories, obituaries, cemetery readings, church records, newspapers, atlases, military records, and other historically significant information.
To facilitate research, volunteers have compiled indexes to much of the reference material. Annually, more than 1,000 individuals, from across the United States as well as Canada, visit the library to browse the collection.