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Scientific American
Stories by William Metcalf
The Sciences
September 3, 1904
Alloy Steels
William Metcalf
The Sciences
September 12, 1903
Springs
William Metcalf
The Sciences
April 17, 1880
Why Does Steel Harden?
William Metcalf
The Sciences
April 10, 1880
Why does Steel Harden?
William Metcalf
