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by Thomas H. Wonnacott (University of Western Ontario); Ronald J. Wonnacott (University of Western Ontario)
by Newman, John Henry; Ward, Leo L.
by Bock, R. Darrell; University of California, Los Angeles Center for Research in evaluatio; Norc (Organization)
by Balderston, Frederick E.
by Williams, Tennessee
by Smith, Robert W.
by Horn, Stanley F.
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