Apparently several composers have set Elizabeth Shane's poem to music. The British Library has these:

1. Music by Albert Hay Malotte, 1946.
2. Music by John F. Larchet, 1947.
3. Music by Joseph Gormley, 1955.
4. Music by Reginald C. Noel Johnson, 1960.
5. Music by Dorothy Parke, 1980.

You might try The Sheet Music Warehouse (UK) (although the site seems to be down right now).