| Reference | {Deposit:: GORDON, SAMUEL G.,(1922) THE MINERALOGY OF PENNA., S. P. NO.}{Deposit:: ACADEMY OF NATURAL SCIENCES OF PHILA.}{Deposit:: ONEILL, BERNARD JR, (1964) ATLAS OF PENNA. MINERAL RESOURCES}{Deposit:: 3, METAL MINES AND OCCURRANCES IN PENNA., BULL. M50, PENNA.}{Deposit:: SURVEY 4TH SERIES} |