Another composition by Clarence Grant Hamilton is in Maria Leiper and Henry W. Simon, A Treasury of Hymns (Cornerstone Library, 1953, 1968, p. 125), alongside of the Ward tune, and with this note:

Several settings have been made for the hymn ["America the Beautiful"]. Ward's MATERNA (originally and still associated with "O mother dear, Jerusalem") is not likely to be dislodged as the most favored tune, but AMERICA THE BEAUTIFUL, by Clarence Grant Hamilton, is sometimes used. Mr. Hamilton was professor of music at Wellesley College at the time Miss Bates was professor of English there, and the two were good friends. It is assumed by Miss Bates' biographer, Dorothy Burges, that the Hamilton tune--sung at Wellesley for many years--was preferred by Miss Bates.

~Masato