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1Published 1977Subjects: “...Nature conservation United States....”
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2Published 1931Subjects: “...Natural resources....”
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3Published 1977Subjects: “...Natural resources....”
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4Published 1970Subjects: “...Conservation of natural resources....”
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5Published 1980Subjects: “...Natural gas....”
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6Published 1969Subjects: “...Conservation of natural resources....”
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7Published 1980Subjects: “...Natural gas Texas....”
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8Published 2004Subjects: “...Conservation of natural resources United States....”
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9Published 2004Subjects: “...Conservation of natural resources United States....”
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11Published 1883Subjects: “...Natural resources....”
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12Published 1979Subjects: “...Conservation of natural resources....”
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14Published 1977Subjects: “...Conservation of natural resources....”
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15Published 1977Subjects: “...Conservation of natural resources....”
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16Published 1979Subjects: “...Conservation of natural resources....”
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17Published 1888Subjects: “...Conservation of natural resources....”
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18Published 1969Subjects: “...Conservation of natural resources....”
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19Published 1972Subjects: “...Natural gas Indian Territory....”
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20Published 1976Subjects: “...Natural resources Management....”
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