| Reference | {Deposit:: PEARRE,NC AND HEYL,AV COPPER,ZINC,LEAD,IRON,COBALT,AND BARIT}{Deposit:: ITS IN THE PIEDMONT UPLAND OF MARYLAND,MARYLAND GEOLOGICAL S}{Deposit:: BULLETIN 28 1965}{Deposit:: PEARRE,NC,1961 MINERAL DEPOSITS OF MARYLAND,EXCLUDING FUEL,S}{Deposit:: GRAVEL, MARYLAND GEOLOGICAL SURVEY,MINERAL INVESTIGATIONS RE}{Deposit:: MAP MR 12} |