Kornblum, William
Social problems
Prentice-Hall, 1992
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Russell, Bertrand, 1872-1970
The problems of philosophy
Oxford University Press, 1912
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Henslin, James M.
Social problems
McGraw-Hill, 1983
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Palen, J. John
Social problems
McGraw-Hill, 1979
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Brown, Milton P.
Problems in marketing
New York, N.Y. , McGraw-Hill
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