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The oil producing industry in your state.

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Item Link Original Source
Limited (search only)   1950 University of Illinois at Urbana-Champaign
Limited (search only)   1954 University of Illinois at Urbana-Champaign
Limited (search only)   1958-63 University of Illinois at Urbana-Champaign
Limited (search only)   1974 Pennsylvania State University
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