Where does one find, for free, such things as:

U.S. Notice to Mariners;
Sailing Directions (enroute and planning guides);
NGA List of Lights;
US Coast Guard Light Lists;
American Practical Navigator (Bowditch);
Sight Reduction Tables (Air and Nautical!);
Radio Navigation Aids:
and other navigation science publications?

They are all available for download at: http://www.nga.mil/portal/site/maritime/

I am guessing that there are over 100 nautical publications here for the asking.

Roger
REBOOT USA 60493