Volume 145, Issue 6
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Features
A New Way to Control Rickets
Space as Yet Unfathomed
Better Engines for Navy Planes
Speeding up Railway Freight
Man-Made Oases in American Deserts
As population has increased, so, too, has the demand for water—and the controversies over who owns it
Poland Becomes a Maritime Nation
Has Forest Conservation Created a False Alarm?
American Forests, Washington, D.C.