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Vertical interval is the difference in elevation between adjacent contours.
Keywordshill, cartography, elevation, topography, contour lines, topographic map, vertical interval, V.I.
Lieutenant Colonel William E. Persons, Infantry Major Oliver S. Wood, Infantry Major Joseph Plassmeyer, Cavalry Captain Paul V. Kellogg and , Infantry First Lieutenant John E.McCammon Military Science and Tactics (, MO: The University Co-operative Store, 1922)
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