The National Geographic has opened a website providing too mis that appear to be 7 1/2 USC&Gs quadrangles. The maps are in .pdf format and downloadable and printable.
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http://petapixel.com/2016/08/06/nat-geo-launches-free-website-printing-detailed-topographical-maps/>
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http://petapixel.com/2016/08/06/nat-geo-launches-free-website-printing-detailed-topographical-maps/>