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1
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2Published 1972“...United States Social conditions 1960-1980....”
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3by Ackoff, Russell Lincoln, 1919-“...United States Social conditions 1960-1980....”
Published 1974
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4Published 1971“...United States Social conditions 1960-1980....”
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5
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6
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7Published 1975“...United States Social conditions 1960-1980 Congresses....”
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8