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Contour lines derived from Stratmap data. Downloaded from TNRIS.org<\/SPAN><\/P>

Elevation contour DLG's (digital line graphics) are digital versions of the contour lines on all 7.5 minute, 1:24,000 scale USGS quadrangle maps. Elevation contours are also referred to as hypsography, meaning topographic relief. The contour interval used for StratMap digital contours is the same as that found on 7.5 minute USGS maps. 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