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Scientific American, Vol. 98, No. 20 (1908) (1908)
leaf 4
sults of the tests is depression instrument, or where the height of the the first cost of a range finder; while -the latter is published in the January-February issue of the Journal more accurate and far more durable than the gun itself of the United States Artillery. The observations, battery and… … © 1908 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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