Contour System

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In cartography, a contour line (often just called a “contour") joins points of equal elevation (height) above a given level, such as mean sea level. A contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness of slopes. The contour interval of a contour map is the difference in elevation between successive contour lines.

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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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