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You searched for: Format Shapefile Remove constraint Format: Shapefile Subject Imagery and Base Maps Remove constraint Subject: Imagery and Base Maps Place Illinois Remove constraint Place: Illinois
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1. 1:1,000,000-Scale Contours of the Conterminous United States

2014. Geological Survey (U.S.). This line shapefile shows elevation contour lines for the conterminous United States. The map layer was derived from the 100-meter resolution eleva... National Atlas of the United States.