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2Published 1997“...Documentary Educational Resources,...”
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3Published 1998“...Documentary Educational Resources,...”
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4Published 1994“...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 2004“...Documentary Educational Resources,...”
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8Published 2006“...Documentary Educational Resources,...”
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9Published 2003“...Documentary Educational Resources (DER),...”
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10Published 1988“...Documentary Educational Resources [distributor],...”
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