Caldwell’s Illustrated, Historical, Centennial Atlas Of Greene County, Pennsylvania. From actual Surveys by & under the directions of Henry Cring, C.E. Assisted by C.T. Arms, Sr. C.E. J.A. Underwood, C.E. J.A. Howden. P.L. Mason. W.J. Kerstetter, C.E. W.F. Arms, C.E. H. Cring, C.E. Published By J.A. Caldwell, Condit, Ohio. 1876. Engraved, Lithographed & Printed By Otto Krebs, Pittsburgh, Pa.: accessed digitally from David Rumsey Historical Map Collection, http://bit.ly/1dIaFYm, on February 18, 2014.