Notes added to 60 letters

Annotations have been added to 60 letters – css00440 to css00500 – most from William F. Cody to George Beck. In addition, nine people have been added to the personography – George Canfield, Sherman Canfield, Edward Goodman, Frank Grouard, Charles Hayden, Theodore Heckert, John Peake, Jerry Ryan, and Ernest Van Dreveldt – and three encyclopedia entries have been added – Cotton States and International Exposition, the W. F. Cody Transportation Company, and Marquette, Wyoming.