- In the Shadow of Death (English) by McDonald, R. D.
- In the South Seas (English) by Stevenson, Robert Louis
- In the Sweet Dry and Dry (English) by Haley, Bart
- In the Sweet Dry and Dry (English) by Morley, Christopher
- In the Valley (English) by Frederic, Harold
- In the Wars of the Roses - A Story for the Young (English) by Everett-Green, Evelyn
- In the Wilderness (English) by Hichens, Robert Smythe
- In the Wilderness (English) by Warner, Charles Dudley
- In the World War (English) by Czernin, Ottokar
- In the Wrong Paradise (English) by Lang, Andrew
- In the Year 2889 (English) by Verne, Jules
- In the Year 2889 (English) by Verne, Michel
- In the Year of Jubilee (English) by Gissing, George
- In the Yule-Log Glow, Book I - Christmas Tales from 'Round the World (English) by Morris, Harrison S. (Harrison Smith)
- In the Yule-Log Glow, Book II - Christmas Tales from 'Round the World (English) by Morris, Harrison S. (Harrison Smith)
- In Those Days - The Story of an Old Man (English) by Steinberg, Jehudah
- In Time of Emergency - A Citizen's Handbook on Nuclear Attack, Natural Disasters (1968) (English) by United States. Office of Civil Defense
- In Times of Peril (English) by Henty, G. A. (George Alfred)
- Into the Jaws of Death (English) by O'Brien, Jack
- The Intriguers (English) by Bindloss, Harold
- Introduction à l'étude de la médecine expérimentale (French) by Bernard, Claude
- An Introduction to Chemical Science (English) by Williams, Rufus Phillips
- Introduction to Infinitesimal Analysis Functions of one real variable (English) by Lennes, N. J. (Nels Johann)
- Introduction to Infinitesimal Analysis Functions of one real variable (English) by Veblen, Oswald
- Introduction to Non-Violence (English) by Paullin, Theodore
- An Introduction to Philosophy (English) by Fullerton, George Stuart
- Introduction to the Compleat Angler (English) by Lang, Andrew
- Introduction to the Dramas of Balzac (English) by McSpadden, J. Walker (Joseph Walker)
- Introduction to the Dramas of Balzac (English) by Wilson, Epiphanius
- An Introduction to the mortuary customs of the North American Indians (English) by Yarrow, H. C. (Harry Crécy)
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