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81
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84
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85by Bell, A. H. (Alfred Hannam), 1895-Subjects: “...Petroleum Geology Illinois....”
Published 1939
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86
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87Published 1985Subjects: “...Aquifers Illinois Christian County....”
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88Published 1997Subjects: “...Subsidences (Earth movements) Illinois Jefferson County....”
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89by Berg, Richard B., 1937-Subjects: “...Tripoli (Stone) Illinois Southern Region....”
Published 1994
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90Published 1997Subjects: “...Subsidences (Earth movements) Illinois Saline County....”
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91
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92by Marshall, R. B. (Robert Bradford), 1867-1949Subjects: “...Leveling Illinois....”
Published 1918
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93Published 1994Subjects: “...Carbonate reservoirs Illinois....”
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94Published 1994Subjects: “...Floods Illinois....”
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95
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96Published 1990Subjects: “...Mineral industries Illinois Periodicals....”
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97
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98
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99
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100