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1Published 1974“...Documentary Educational Resources,...”
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2Published 1974“...Documentary Educational Resources,...”
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3by Pianco, Benki“...Documentary Educational Resources,...”
Published 2004
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4Published 2007“...Documentary Educational Resources,...”
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5Published 2007“...Documentary Educational Resources,...”
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6Published 2007“...Documentary Educational Resources,...”
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7Published 2007“...Documentary Educational Resources,...”
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8by Heider, Karl G., 1935-“...Documentary Educational Resources,...”
Published 1974
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9Published 1983“...Documentary Educational Resources [distributor],...”
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10Published 2008“...Documentary Educational Resources [distributor],...”
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