Reference | {Deposit:: USGS BULLETIN 359, 1908, PP 74-92}{Deposit:: PA. GEOLOGICAL SURVEY, BULLETIN M50, 1964, PART 3, SHEET 2.}{Deposit:: US BUR. OF MINES, R.I. 4145, 1947, 13 P.}{Deposit:: USGS BULLETIN 969-A, 1950, 25 P.}{Deposit:: PA. GEOLOGICAL SURVEY (2ND), REPORT CC, 1877, PP 1501-1513.} |