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		No cover image available Readability levels of the science textbooks most used in secondary schools by Chiang-Soong, Betty Yager, Robert E Material type: Text; Format: print ; Literary form: Not fiction Availability: No items available.
		No cover image available Science-Technology-Society as reform by Yager, Robert E Material type: Text; Format: print ; Literary form: Not fiction Availability: No items available.
		No cover image available Viewpoint : what we did not learn from the 60s about science curriculum reform by Yager, Robert E Material type: Text; Format: print ; Literary form: Not fiction Availability: No items available.

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