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Engineer course in topography (1922)
U.S. Army Command and General Staff College · Fort Leavenworth, Kan. : The General Service Schools Press · leaf 155
Figure T6Put in 10-foot contours. MAP REPRODUCTION 670 860 6/0 > 797 … 785 Figure T7 Scale 1:20,000 Put in proper contours. 146 TOPOGRAPHY 917 060 96Z S30 878Military topography · Maps, Military
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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