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Chiang-Soong, Betty & Yager, Robert E.. (). The inclusin of STS material in the most frequently used secondary science textbooks in The U.S. (No. 4. Vol. 30 April-1993). : journal of research in science teaching.

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Chiang-Soong, Betty & Yager, Robert E.. The inclusin of STS material in the most frequently used secondary science textbooks in The U.S.. No. 4. Vol. 30 April-1993 : journal of research in science teaching, . Index Artikel.

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Chiang-Soong, Betty & Yager, Robert E.. The inclusin of STS material in the most frequently used secondary science textbooks in The U.S.. No. 4. Vol. 30 April-1993 : journal of research in science teaching, . Index Artikel.

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Chiang-Soong, Betty & Yager, Robert E.. The inclusin of STS material in the most frequently used secondary science textbooks in The U.S.. No. 4. Vol. 30 April-1993 : journal of research in science teaching, . Index Artikel.