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Hair Not Good Material for Test of Razor Blades

First Glances at New Books

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Nature Ramblings: Woodman, Spare That Dead Tree

Radio Knife Invented as Aid to Surgeons

First Glances at New Books

Back Matter

Front Matter

Great Dust Storm Formed from Corn Belt Top-Soil

[Photograph]: A Hat’s Ancestral Tree

Cod Liver Oil Now Used as Wound Dressing

Exposure to Germs Fails to Cause Colds in Volunteers