I counted 26 gospel tunes among the 78s on Honking Duck. There may be more, but I just counted likely titles. Already cited several times: Honk

Are You Washed in the Blood of the Lamb? Jackson Young
Climbing Up the Golden Stairs. The Happy Four
Cuba. Alabama Sacred Heart Singers
Don't You Hear Jerusalem Moan? Gid Tanner and Skillet-Lickers
From Jerusalem to Jerico. Uncle Dave Macon
Jerusalem Moan. Bill Chitwood and Bud Landers
Jordan is a Hard Road to Travel. Uncle dave Macon
Little Moses. Carter Family
Glory to the Lamb. Carter Family
God Gave Noah the Rainbow Sign. Carter Family
Hear dem Bells. Al Hopkins
On the Rock Where Moses Stood. Carter Family
Present Joys. Alabama Sacred Harp Singers
Religion is a Fortune. Alabama Sacred Harp Singers
River of Jordan. Carter Family
Rocky Road. Alabama Sacred Harp Singers
Room in Heaven for Me. Carter Family.
Sea of Galilee. Carter Family
Row Us Over the Tide. Bela Lam, Green Co. Singers
The Lonesome Valley. Carolina Ramblers (related spiritual)
Walk a Little Closer. Carter Family
When I Walked the Streets of Gold. Roper's Mountain Singers
When the Good Lord Sets You Free. Carolina Tarheels
When the World's On Fire. Carter Family
Where Shall I Be? Carter Family
When They Ring The Golden Bells. Alfred G. Karnes