USGS topographic maps available as PDF files

The U.S. Geological Survey has put its entire current topographic map collection on the internet as PDF files. The maps are available at scales of 1:24,000 (1 inch = 2000 feet), 1:100,000 (1 cm = 1 km), and 1:250,000 (approx. 1 inch = 4 miles). There are other sites (such as TopoZone) that offer a …

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