"How the Gates Came Ajar" and others are at Levy:

Title: How the Gates Came Ajar. Song and Chorus.
Composer, Lyricist, Arranger: Composed by Eastburn.
Publication: Cleveland: S. Brainard's Sons, 1869.

Title: The Gates Ajar. Song With Chorus.
Composer, Lyricist, Arranger: Poetry by Geo. Cooper. Music by J.R. Thomas.
J. R. Thomas Publication: New York: C.H. Ditson & Co., 711 Broadway, 1870.

Title: Gates Ajar. Descriptive Ballad.
Composer, Lyricist, Arranger: Composed by G. Estabrook.
Publication: St. Louis: Balmer & Weber, 206 N. 5th St., 1869.