http://digfir-published.macmillanusa.com/deu6e/deu6e_ch1_1.htmlChapter Introduction549a0c8b757a2eed3d000000
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http://digfir-published.macmillanusa.com/deu6e/deu6e_ch1_2.htmlNAVIGATING THE NIGHT SKY549a0c8b757a2eed3d000000
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http://digfir-published.macmillanusa.com/deu6e/deu6e_ch1_3.htmlEARTHLY CYCLES549a0c8b757a2eed3d000000
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http://digfir-published.macmillanusa.com/deu6e/deu6e_ch1_4.htmlTHE SEASONS549a0c8b757a2eed3d000000
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http://digfir-published.macmillanusa.com/deu6e/deu6e_ch1_5.htmlTHE PHASES OF THE MOON549a0c8b757a2eed3d000000
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http://digfir-published.macmillanusa.com/deu6e/deu6e_ch1_6.htmlECLIPSES549a0c8b757a2eed3d000000
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http://digfir-published.macmillanusa.com/deu6e/deu6e_ch1_7.htmlSCALES OF THE UNIVERSE549a0c8b757a2eed3d000000
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http://digfir-published.macmillanusa.com/deu6e/deu6e_ch1_8.htmlSUMMARY OF KEY IDEAS549a0c8b757a2eed3d000000
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http://digfir-published.macmillanusa.com/deu6e/deu6e_ch1_9.htmlEnd of Chapter Questions549a0c8b757a2eed3d000000
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