895 resultados para Technical and economic return


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Mode of access: Internet.

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Mode of access: Internet.

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Bibliography: p. 277-293.

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"Literature": p. 409-466.

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Published also as a thesis (PH.D.) University of Pennsylvania, 1917.

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Thesis (Ph. D.)--University of Wisconsin, 1909.

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"Critical essay on authorities": p. [342]-357.

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Submitted to the Environmental Protection Agency on Sept. 12, 1977.

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"Submitted to the Environmental Protection Agency on September 12, 1977 and November 30, 1978."

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Prepared in cooperation with state agricultural stations, cooperative extension service, and other state agencies.