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1Published 2003“...Documentary Educational Resources,...”
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2Published 1986“...Documentary Educational Resources,...”
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3Published 2005“...Documentary Educational Resources,...”
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4Published 2004“...Documentary Educational Resources,...”
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5Published 2004“...Documentary Educational Resources,...”
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6Published 1972“...Documentary Educational Resources, Incorporated,...”
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7Published 2009“...Documentary Educational Resources (DER),...”
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8Published 2009“...Documentary Educational Resources (DER),...”
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9Published 1969“...Documentary Educational Resources (DER),...”
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10Published 2009“...Documentary Educational Resources (DER),...”
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11Published 1974“...Documentary Educational Resources (DER),...”
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12Published 2009“...Documentary Educational Resources (DER),...”
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13Published 1974“...Documentary Educational Resources, Incorporated,...”
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14
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15Published 1972“...Documentary Educational Resources, Incorporated,...”
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