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1. 

   Front Matter

   By Science NewsApril 9, 1927

2. 

   Front Matter

   By Science NewsApril 23, 1927

3. 

   Front Matter

   By Science NewsApril 30, 1927

4. 

   Front Matter

   By Science NewsMay 7, 1927

5. 

   Front Matter

   By Science NewsMay 14, 1927

6. 

   Front Matter

   By Science NewsMay 21, 1927

7. 

   Front Matter

   By Science NewsMay 28, 1927

8. 

   Front Matter

   By Science NewsJune 4, 1927

9. 

   Front Matter

   By Science NewsJune 11, 1927

10. 

    Front Matter

    By Science NewsJune 18, 1927

11. 

    Man’s Age Now Set at Millions of Years

    By Science NewsJune 25, 1927

12. 

    Volume Information

    By Science NewsJuly 2, 1927