Hymn Collection of John Rylands: At University of Manchester, UK: 60,000 hymns collected for editing "Hymns for the Church Universal," 1885.
Mennonite Historical Library: Hartzler Collection: (3000+ books with a strong emphasis on American nineteenth century hymnody) General description of collection.
Regent University Library: Clark Hymnology Collection: Brief summary with library contact information.
The Hymnal Attic: Roger Hicks, personal collection: complete catalog; also bibliography of published articles.
The Robert Guy McCutchan Collection of Hymnology: [at Claremont] Brief summary; contact information.
Wheaton College Special Collections: Hymnals: Online catalog.