Osborn, Henry Fairfield, 1857-1935.
[Author];
Gregory, William K. (William King), 1876-
[Author];
Wortman, Jacob Lawson.
[Author];
Peterson, Olof August, 1865-1933.
[Author];
Matthew, William Diller, 1871-1930.
[Author];
Granger, Walter, 1872-1941.
[Author]