Volume 116, Issue 26
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Features
Exploring the Burrows of the German Army
Elaborate and Well Furnished Subterranean Dwellings
[bunkers and dugouts on the Western Front]
American Supremacy of the Air
The Problem of the Air Craft Production Board
Strategic Moves of the War--June 21st, 1917
By Our Military Expert
[Russian revolution, Macedonia, Ypres]
What I Can Do for My Country
VI. The Civil Engineer
Recent Chemical Developments- June 30, 1917
Grinding Wheels
The Submarine Problem--V.
Some Points in the U-boat Campaign