Seen on Backpacker.com
National Geographic has built an easy to use web interface that allows anyone to quickly find any quad in the country for downloading and printing. Each quad has been pre-processed to print on a standard home, letter size printer. These are the same quads that were printed by USGS for decades on giant bus-sized pressed but are now available in multi-page PDFs that can be printed just about anywhere. They are pre-packaged using the standard 7.5 minute, 1:24,000 base but with some twists: