This is a topographic map. Topographic maps are representations of a three dimensional surface on a flat piece of paper. The shaded relief portions on this maps are to represent elevation. Most maps are laid out in rectangular blocks with sides parallel to latitude and longitude lines. Topographic quadrangle maps west of the Mississippi River are laid out in township, range and section as well as latitude and longitude. Topographic maps can be helpful locating certain lines of an area.
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