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1by Qin, Wen-jie“...Documentary Educational Resources,...”
Published 1997
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2by Howes, Arthur“...Documentary Educational Resources,...”
Published 2002
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3by Mourão, Catarina“...Documentary Educational Resources,...”
Published 2006
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4Published 1972“...Documentary Educational Resources, Incorporated,...”
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5Published 1974“...Documentary Educational Resources (DER),...”
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6Published 2009“...Documentary Educational Resources (DER),...”
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7Published 1974“...Documentary Educational Resources, Incorporated,...”
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8
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9Published 1972“...Documentary Educational Resources, Incorporated,...”
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10by Marshall, John, 1932-“...Documentary Educational Resources (DER),...”
Published 1975
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