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At what scales are contours visible in The National Map Viewer?

The 500-foot contours are shown at a scale of 578K in base maps, while 100-foot contours are visible at 289K/144K and 50-foot contours are visible at 72K.  Large scale contours from US Topo products are shown from 36K to 18K, and in dynamic base map services for scales larger than 18K.

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