In 1866 the copyright and plates were bought by the Hydrographic Office of the United States Navy, and as a U.S. Government publication, it is now available for free online.
The copyright were bought by the Hydrographic Office of the United States Navy. This was in 1866. Plates were bought by the Hydrographic Office of the United States Navy. This was in 1866. It is now available for free online. This is as a U.S. Government publication.