- Illusions: A Psychological StudyAuthor: James SullyReleased on Project Gutenberg: February 21, 2006
- Illustrated Catalogue of a Portion of the Collections Made During the Field Season of 1881: Third Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1881-82, Government Printing Office, Washington, 1884, pages 427-510Author: William Henry HolmesReleased on Project Gutenberg: October 1, 2006
- Illustrated Catalogue of the Collections Obtained from the Indians of New Mexico And Arizona in 1879: Second Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1880-81, Government Printing Office, Washington, 1883, pages 307-428Author: James StevensonReleased on Project Gutenberg: July 2, 2006
- Illustrated Catalogue of the Collections Obtained from the Indians of New Mexico in 1880: Second Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1880-81, Government Printing Office, Washington, 1883, pages 429-466Author: James StevensonReleased on Project Gutenberg: June 27, 2006
- Illustrated Catalogue of the Collections Obtained from the Pueblos of Zuñi, New Mexico, and Wolpi, Arizona, in 1881: Third Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1881-82, Government Printing Office, Washington, 1884, pages 511-594Author: James StevensonReleased on Project Gutenberg: October 23, 2006
- Illustrated History of Furniture: From the Earliest to the Present TimeAuthor: Frederick LitchfieldReleased on Project Gutenberg: May 1, 2004
- Illustrated Science for Boys and GirlsAuthor: AnonymousReleased on Project Gutenberg: June 17, 2008
- Illustration of the Method of Recording Indian Languages: From the First Annual Report of the Bureau of Ethnology, Smithsonian InstitutionAuthor: James Owen Dorsey, Albert S. (Albert Samuel) Gatschet, Stephen Return RiggsReleased on Project Gutenberg: November 11, 2005
- Image of the GodsAuthor: Alan Edward NourseReleased on Project Gutenberg: October 3, 2007
- Imaginary Conversations and Poems: A SelectionAuthor: Walter Savage LandorReleased on Project Gutenberg: May 28, 2007
- Imaginary PortraitsAuthor: Walter PaterReleased on Project Gutenberg: November 1, 2000
- Imaginary PortraitsAuthor: Walter PaterReleased on Project Gutenberg: May 1, 2003
- Imaginations and ReveriesAuthor: George William RussellReleased on Project Gutenberg: May 1, 2005
- ImmenseeAuthor: Theodor StormReleased on Project Gutenberg: October 1, 2004
- Immortal MemoriesAuthor: Clement King ShorterReleased on Project Gutenberg: June 19, 2007
- Imogen: A Pastoral RomanceAuthor: William GodwinReleased on Project Gutenberg: October 1, 2005
- ImpactAuthor: Cox, Irving E., Jr.Released on Project Gutenberg: May 23, 2008
- Imperial PurpleAuthor: Edgar SaltusReleased on Project Gutenberg: July 1, 2003
- Imperium in Imperio: A Study of the Negro Race Problem. A NovelAuthor: Sutton E. (Sutton Elbert) GriggsReleased on Project Gutenberg: March 24, 2005
- Impressions and CommentsAuthor: Havelock EllisReleased on Project Gutenberg: May 1, 2005
- Impressions of a War CorrespondentAuthor: George LynchReleased on Project Gutenberg: June 1, 2007
- Impressions of America During the Years 1833, 1834 and 1835. Volume 1 (of 2)Author: Tyrone PowerReleased on Project Gutenberg: September 28, 2007
- Impressions of America During the Years 1833, 1834 and 1835. Volume 2 (of 2)Author: Tyrone PowerReleased on Project Gutenberg: November 1, 2007
- Impressions of South AfricaAuthor: Bryce, James Bryce, ViscountReleased on Project Gutenberg: August 14, 2007
- Impressions of Theophrastus SuchAuthor: George EliotReleased on Project Gutenberg: January 1, 2004
- In a German PensionAuthor: Katherine MansfieldReleased on Project Gutenberg: September 1, 1998
- In a Green Shade: A Country CommentaryAuthor: Maurice HewlettReleased on Project Gutenberg: March 29, 2005
- In a Hollow of the HillsAuthor: Bret HarteReleased on Project Gutenberg: May 1, 2000
- In a new worldAuthor: Alger, Horatio, Jr.Released on Project Gutenberg: July 23, 2008
- In a steamer chair, and other shipboard storiesAuthor: Robert BarrReleased on Project Gutenberg: November 1, 2005
- In Africa: Hunting Adventures in the Big Game CountryAuthor: John T. (John Tinney) McCutcheonReleased on Project Gutenberg: April 29, 2007
- In ancient AlbemarleAuthor: Catherine Albertson, Mabel PughReleased on Project Gutenberg: June 16, 2008
- In and Around BerlinAuthor: Minerva Brace NortonReleased on Project Gutenberg: June 1, 2007
- In and out of Three Normandy InnsAuthor: Anna Bowman DoddReleased on Project Gutenberg: April 1, 2005
- In Apple-Blossom Time: A Fairy-Tale to DateAuthor: Clara Louise Burnham, Morgan DennisReleased on Project Gutenberg: March 25, 2007
- In Blue Creek CañonAuthor: Anna Chapin RayReleased on Project Gutenberg: December 24, 2007
- In Bohemia with Du Maurier: The First of a Series of ReminiscencesAuthor: Felix MoschelesReleased on Project Gutenberg: September 24, 2004
- In Camp on the Big SunflowerAuthor: Leslie, Lawrence J.Released on Project Gutenberg: November 1, 2004
- In Case of FireAuthor: Randall Garrett, Martinez [Illustrator]Released on Project Gutenberg: February 5, 2008
- In Clive's Command: A Story of the Fight for IndiaAuthor: Strang, HerbertReleased on Project Gutenberg: July 29, 2005
- In Connection with the De Willoughby ClaimAuthor: Frances Hodgson BurnettReleased on Project Gutenberg: June 16, 2008
- In Darkest England, and the Way OutAuthor: William BoothReleased on Project Gutenberg: March 1, 1996
- In Defence of Harriet ShelleyAuthor: Mark TwainReleased on Project Gutenberg: September 16, 2004
- In Defense of WomenAuthor: H. L. (Henry Louis) MenckenReleased on Project Gutenberg: April 1, 1998
- In Direst PerilAuthor: David Christie MurrayReleased on Project Gutenberg: August 1, 2007
- In Divers TonesAuthor: Roberts, Charles G. D., SirReleased on Project Gutenberg: November 1, 2004
- In Exile, and Other StoriesAuthor: Mary Hallock FooteReleased on Project Gutenberg: July 1, 2005
- In Flanders Fields, and Other PoemsAuthor: John McCrae, Andrew MacphailReleased on Project Gutenberg: July 5, 2008
- In Freedom's Cause : A Story of Wallace and BruceAuthor: G. A. (George Alfred) HentyReleased on Project Gutenberg: December 1, 2003
- In Friendship's GuiseAuthor: William Murray GraydonReleased on Project Gutenberg: May 31, 2005
- In Ghostly JapanAuthor: Lafcadio HearnReleased on Project Gutenberg: May 1, 2005
- In Happy ValleyAuthor: Fox, John, Jr., F. C. (Frederick Coffay) YohnReleased on Project Gutenberg: January 5, 2007
- In His ImageAuthor: William Jennings BryanReleased on Project Gutenberg: June 25, 2004
- In His StepsAuthor: Charles M. SheldonReleased on Project Gutenberg: October 1, 2003
- In HomespunAuthor: E. (Edith) NesbitReleased on Project Gutenberg: August 1, 2003
- In Honour's Cause: A Tale of the Days of George the FirstAuthor: George Manville Fenn, Lancelot SpeedReleased on Project Gutenberg: May 4, 2007
- In Indian Mexico (1908)Author: Frederick StarrReleased on Project Gutenberg: July 2, 2005
- In Kedar's TentsAuthor: Henry Seton MerrimanReleased on Project Gutenberg: June 1, 2004
- In Kings' BywaysAuthor: Stanley John WeymanReleased on Project Gutenberg: August 16, 2007
- In Luck at LastAuthor: Walter BesantReleased on Project Gutenberg: June 25, 2005