Nice find! Like oplopanax said, the black and white aren't that great but they're actually pretty decent in color. Magnetic declination might be worth double checking if you're using them for navigation.
The latest digital raster versions are available for free for personal use. Vector and raw data and any commercial usage is paid only.
I've pulled a few grids of the areas I needed and overlaid them with the relevant trails/POI. Printed for easy planning and wall candy. You could even crop, shrink, and laser print onto clear overhead plastic sheets for custom maps.