Camp Cajon - Cover art from Popular Mechanics, December 1919: How military tank technology will help the mountain tourist! This is the issue that had the first nationally published photo of Camp
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Popular Mechanics Magazine (three issues). January, February, and March 1936. "The Next War by H. H. (editor) Windsor - Paperback - 1936 - from Sandhill Books (SKU: 001375)
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Here's a Terrifying Popular Mechanics Magazine Cover from World War I – The Man in the Gray Flannel Suit
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1943 Cover Popular Mechanics Rocket Thrower Russian Military Equipment – Period Paper Historic Art LLC
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