External links Tioga County, Pennsylvania Map 562 *Augmented by Williams, J. H., Taylor, L. E., and Low, D. J. (1993), Surficial geologic map of major glaciated valleys of Bradford, Tioga, and Potter Counties, Pennsylvania, showing locations of wells, test holes, and data-collection sites, Pennsylvania Geological Survey, 4th ser., Water Resource Report 68.
External links Tioga County Pennsylvania Map 562 *Augmented by Williams, J. H., Taylor, L E., and Low, D. J. (199.3), Surficial geologic map of major glaciated valleys of ,Bradford, Tioga, and Potter Coun,ties, Pennsylvania, showing locations of wells, test holes, and data-collection sites Pennsylvania Geological Survey, 4th ser., Water Resource Report 68.