992 resultados para Illinois State Water Survey


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"Cooperating agencies: Illinois State Geological Survey, Dept. of Natural Resources ; Bureau of Mines, United States Dept. of the Interior."

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Mode of access: Internet.

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"Critical Trends Assessment Progarm."--Cover.

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Description based on: 1953.

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"Conducted by the Illinois State Geological Survey in cooperation with the Boone County Board, Winnebago County Board, Boone County Soil and Water Conservation District, Winnebage County Soil and Water Conservation District and Rock Valley College."

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"September 1992."--P. [4] of cover.

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"Critical Trends Assessment Program."--Cover.

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"June 1998."

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Includes bibliographical references (p. 19-20).