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1Published 1978“...Documentary Educational Resources,...”
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2Published 1995“...Documentary Educational Resources,...”
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3Published 1994“...Documentary Educational Resources,...”
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4Published 1975“...Documentary Educational Resources,...”
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5Published 1985“...Documentary Educational Resources,...”
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6Published 1974“...Documentary Educational Resources,...”
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7Published 2005“...Documentary Educational Resources [distributor],...”
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8Published 2007“...Distributed by Documentary Educational Resources,...”
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