Reference | {Deposit:: BASCOM, E. T., ET AL, GEOLOGY ANDMINERAL RESOURCES OF THE QU}{Deposit:: N-DOYLESTOWN DISTRICT, PA. AND N. J., USGS BULL. 828, PG 52,}{Deposit:: GUALT, H. R., MINERAL RESOURCES (IN) GEOLOGY AND MINERAL RES}{Deposit:: OF BUCKS CO. PA., BULL. C9, 1959 PA. GEOLOGICAL SURVEY} |