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1Published 1957“...University of Nebraska Press,...”
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2Published 1958“...University of Nebraska Press,...”
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3Published 1959“...University of Nebraska Press,...”
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4Published 1960“...University of Nebraska Press,...”
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5Published 1961“...University of Nebraska Press,...”
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6Published 1956“...University of Nebraska Press,...”
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7Published 1955“...University of Nebraska Press,...”
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