Hymns
Free to read here, from Project Gutenberg.
The Story of the Hymns and Tunes
The Story of Our Hymns
Christian Hymns of the First Three Centuries
The Singing Church: The Hymns It Wrote and Sang
Hymns, Songs, and Fables, for Young People
Cousin Hatty's Hymns and Twilight Stories
Hymns in Human Experience
Thy Sea is Great, Our Boats are Small, and Other Hymns of To-Day
Hymnological Studies
A Practical Discourse on Some Principles of Hymn-Singing