The Hewins tune (pdf) is at the Levy collection.

Levy Call Number: Box 011, Item 038
Title: America the Beautiful. "God Shed His Grace on Thee."
Composer, Lyricist, Arranger: Words by Katharine Lee Bates, Wellesley, Mass.; Music by Parke W. Hewins, Wellesley Hills, Mass.
Publication: n.p.
Date: 1917