Annual report on mining activities /
Commonwealth of Pennsylvania, Department of Environmental Resources.

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Item Link Original Source
Limited (search only)   1979 Pennsylvania State University
Limited (search only)   1980 Pennsylvania State University
Limited (search only)   1982 Pennsylvania State University
Limited (search only)   1983 Pennsylvania State University
Limited (search only)   1984 Pennsylvania State University
Limited (search only)   1985 Pennsylvania State University
Limited (search only)   1986 Pennsylvania State University
Limited (search only)   1987 Pennsylvania State University
Limited (search only)   1988 Pennsylvania State University
Limited (search only)   1989 Pennsylvania State University
Limited (search only)   1990 Pennsylvania State University
Limited (search only)   1990 Pennsylvania State University
Limited (search only)   1991 Pennsylvania State University
Limited (search only)   1991 Pennsylvania State University
Limited (search only)   1992 Pennsylvania State University
Limited (search only)   1992 Pennsylvania State University
Limited (search only)   1993 Pennsylvania State University
Limited (search only)   1993 Pennsylvania State University
Limited (search only)   1994 Pennsylvania State University
Limited (search only)   1994 Pennsylvania State University
Limited (search only)   1995 Pennsylvania State University
Limited (search only)   1996 Pennsylvania State University
Limited (search only)   1997 Pennsylvania State University