Books: co co education (sorted alphabetically)
- Court Life in China: The Capital, Its Officials and People Isaac Taylor Headland
- Crayon and Character: Truth Made Clear Through Eye and Ear B. J. Griswold
- Critiques and Addresses Thomas Henry Huxley
- Crown of Wild Olive John Ruskin
- Curious Republic of Gondour, and Other Whimsical Sketches Mark Twain
- Cyropaedia: The Education of Cyrus Xenophon
- Cyr Readers: Book 8 Ellen M. Cyr
- Daddy-Long-Legs Jean Webster
- Daddy-Long-Legs Jean Webster
- Danny's Own Story Don Marquis
- Dante: "The Central Man of All the World" John T. Slattery
- Dark Night's Work Elizabeth Cleghorn Gaskell
- Daughter of Eve Honoré de Balzac
- Daughter of the Land Gene Stratton-Porter
- David Crockett: His Life and Adventures John S. C. Abbott
- day at Happy Hollow School Lettie Cook Van Derveer
- Day Before Yesterday Richard Middleton
- Deaf and Dumb! Elizabeth Sandham
- Debating for boys William Horton Foster
- Decadence, and Other Essays on the Culture of Ideas Remy de Gourmont
- Decimal Classification. Tables générales (French) International Institute of Bibliography
- Defence of Poesie and Poems Philip Sidney
- De l'amour (French) Charles Baudelaire
- Del libro impreso al libro digital (Spanish) Marie Lebert
- Delsarte System of Oratory Delaumosne