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  1. [cartography] A rectangular map bounded by increments of latitude and longitude (quadrilaterals). Often a map sheet in either the 7.5-minute or 15-minute series published by the U.S. Geological Survey. Often known as topo sheet or shortened to quad. Each map in the series is usually named after a local physiographic feature in the mapped series, such as the Ranger Creek, Texas, quad map. Media/quadrangle.gif

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