This edition of Santa Fe’s booklet about the Grand Canyon is four pages longer than the 1923 version. Much of the text is the same, but this one has new photos and more of them. In addition, the centerfold has a color “airplane view” of the canyon rather than the plain map found in the 1923 edition.
A 1940 edition is also available on this site. That one was completely rewritten from the versions used in the 1920s.