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Evolution and Sexuality

Result of Former and Persisting Reaction Between Organism and External Conditions

By Etienne Rabaud

Progress in Naval Aircraft—II

Contributions to Naval Aircraft Design and Construction by the United States, Culminating in the “NC-4” Type

By J. C. Hunsaker

Pulverized Coal—I

Summary of a Report on Methods of Utilizing Otherwise Waste Coal

By Leonard C. Harvey


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    August 16, 1919

    See the World from a Different Perspective

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