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U.S. Geological Survey, Minerals and Information CD-ROM, (CD-ROM)
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Energy InfoDisc, Vol. 1, No. 4, 1996, (CD-ROM)
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C 21.31:US-1996-50 C
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C 21.31:US-1996-50 B
USAPAT, Facsimile Images of United States Patents, US-1996-50B, (CD-ROM)
C 21.31:US-1996-50 A
USAPAT, Facsimile Images of United States Patents, US-1996-50A, (CD-ROM)
C 21.31:US-1996-51 A
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C 21.31:US-1996-51 C
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USAPAT, Facsimile Images of United States Patents, US-1996-51D, (CD-ROM)