USGS topographic quadrangles updated

The USGS has shifted their collection of historical and modern quadrangle maps to a new hosting provider (Amazon S3). I've updated all of our quadrangle links to point to the new files. One advantage of the new hosting system is that the maps are no longer tucked away in ZIP archives, so the PDF files can now be downloaded directly.

To access the quadrangles, pick any county and then click the Quadrangles link in the top menu bar. You can also find links from each landmark page.

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