- Scientific American Supplement, No. 832, December 12, 1891Author: VariousReleased on Project Gutenberg: February 14, 2005
- Scientific American Supplement, No. 841, February 13, 1892Author: VariousReleased on Project Gutenberg: February 27, 2005
- Scientific American, Volume 17, No. 26 December 28, 1867: A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures.Author: VariousReleased on Project Gutenberg: September 1, 2005
- Scientific American, Volume 22, No. 1, January 1, 1870: A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures.Author: VariousReleased on Project Gutenberg: September 1, 2005
- Scientific American, Volume 40, No. 13, March 29, 1879: A Weekly Journal of Practical Information, Art, Science,: Mechanics, Chemistry, and ManufacturesAuthor: VariousReleased on Project Gutenberg: July 18, 2006
- Scientific Essays and LecturesAuthor: Charles KingsleyReleased on Project Gutenberg: December 1, 2003
- Scorched Earth: A Future History of Planet EarthAuthor: Walter D. PetrovicReleased on Project Gutenberg: September 26, 2004
- Scotch Loch-FishingAuthor: William SeniorReleased on Project Gutenberg: July 16, 2008
- Scotland's Mark on AmericaAuthor: George Fraser BlackReleased on Project Gutenberg: February 24, 2005
- Scott's Last Expedition, Volume I: Being the journals of Captain R. F. ScottAuthor: Robert Falcon ScottReleased on Project Gutenberg: March 1, 2004
- Scottish Cathedrals and AbbeysAuthor: Dugald Butler, Robert Herbert StoryReleased on Project Gutenberg: June 6, 2007
- Scottish Ghost StoriesAuthor: Elliott O'DonnellReleased on Project Gutenberg: December 7, 2006
- Scottish sketchesAuthor: Amelia E. BarrReleased on Project Gutenberg: December 28, 2004
- ScrimshawAuthor: Murray Leinster, Kelly FreasReleased on Project Gutenberg: December 10, 2007
- Sculpture of the Exposition Palaces and Courts: Descriptive Notes on the Art of the Statuary at the Panama-Pacific International Exposition, San FranciscoAuthor: Juliet Helena Lumbard JamesReleased on Project Gutenberg: May 1, 2004
- Se-quo-yah; from Harper's New Monthly, V.41Author: UnknownReleased on Project Gutenberg: July 1, 2003
- Sea and Shore: A Sequel to "Miriam's Memoirs"Author: Catherine A. (Catherine Ann) WarfieldReleased on Project Gutenberg: February 21, 2005
- Sea Power in its Relations to the War of 1812. Volume 1Author: A. T. (Alfred Thayer) MahanReleased on Project Gutenberg: June 30, 2008
- Sea Power in its Relations to the War of 1812. Volume 2Author: A. T. (Alfred Thayer) MahanReleased on Project Gutenberg: June 30, 2008
- Sea urchinsAuthor: W. W. (William Wymark) JacobsReleased on Project Gutenberg: June 25, 2007
- Sea WarfareAuthor: Rudyard KiplingReleased on Project Gutenberg: February 6, 2006
- Sea-dogs all!Author: Tom BevanReleased on Project Gutenberg: June 1, 2008
- Sea-Power and Other StudiesAuthor: Bridge, Cyprian, SirReleased on Project Gutenberg: January 1, 2004
- Sea-Wolves of the Mediterranean: The grand period of the Moslem corsairsAuthor: Currey, E. Hamilton (Edward Hamilton), -Released on Project Gutenberg: October 10, 2004
- Searchlights on Health: Light on Dark Corners: A Complete Sexual Science and a Guide to Purity and Physical Manhood, Advice To Maiden, Wife, And Mother, Love, Courtship, And MarriageAuthor: B. G. (Benjamin Grant) Jefferis, Nichols, J. L. (James Lawrence), -Released on Project Gutenberg: November 24, 2007
- Searchlights on Health: The Science of EugenicsAuthor: B. G. (Benjamin Grant) Jefferis, Nichols, J. L. (James Lawrence), -Released on Project Gutenberg: September 12, 2004
- Seaward Sussex: The South Downs from End to EndAuthor: Edric Holmes, Vigers, Mary M. [Illustrator]Released on Project Gutenberg: June 1, 2004
- Second AprilAuthor: Edna St. Vincent MillayReleased on Project Gutenberg: March 1, 1998
- Second Book of TalesAuthor: Eugene FieldReleased on Project Gutenberg: June 11, 2007
- Second LandingAuthor: F. L. (Floyd L.) WallaceReleased on Project Gutenberg: March 30, 2008
- Second PlaysAuthor: A. A. (Alan Alexander) MilneReleased on Project Gutenberg: January 19, 2005
- Second Shetland Truck System ReportAuthor: William GuthrieReleased on Project Gutenberg: January 1, 2003
- Second SightAuthor: Alan Edward NourseReleased on Project Gutenberg: October 16, 2007
- Second Treatise of GovernmentAuthor: John LockeReleased on Project Gutenberg: January 1, 2005
- Secret armiesAuthor: John L. (John Louis) SpivakReleased on Project Gutenberg: September 20, 2007
- Secret Band of Brothers: A Full and True Exposition of All the Various Crimes, Villanies, and Misdeeds of This Powerful Organization in the United States.Author: J. H. (Jonathan Harrington) GreenReleased on Project Gutenberg: March 4, 2006
- Secret BreadAuthor: F. Tennyson (Fryniwyd Tennyson) JesseReleased on Project Gutenberg: September 11, 2005
- Secret Chambers and Hiding Places: Historic, Romantic, & Legendary Stories & Traditions About Hiding-Holes, Secret Chambers, Etc.Author: Allan FeaReleased on Project Gutenberg: November 1, 2004
- Secret Enemies of True Republicanism: Most important developments regarding the inner life of man and the spirit world, in order to abolish revolutions and wars and to establish permanent peace on earth, also: the plan for redemption of nations from monarchical and other oppresive [sic] speculationsAuthor: Andrew B. (Andreas Bernardus) SmolnikarReleased on Project Gutenberg: January 12, 2005
- Secret History Revealed By Lady Peggy O'MalleyAuthor: C. N. (Charles Norris) Williamson, A. M. (Alice Muriel) Williamson, Clarence RoweReleased on Project Gutenberg: September 17, 2006
- Secret societies and subversive movementsAuthor: Nesta Helen WebsterReleased on Project Gutenberg: August 23, 2006
- Secret Societies: A Discussion of Their Character and ClaimsAuthor: David Macdill, Edward Beecher, Jonathan BlanchardReleased on Project Gutenberg: October 15, 2004
- Secrets of the woodsAuthor: William J. (William Joseph) LongReleased on Project Gutenberg: September 1, 1999
- SecurityAuthor: Poul AndersonReleased on Project Gutenberg: August 4, 2007
- SecurityAuthor: Kenyon, Ernest M.Released on Project Gutenberg: July 28, 2008
- Security in Your Old Age: To Employees of Industrial and Business Establishments, Factories, Shops, Mines, Mills, Stores, Offices and Other Places of BusinessAuthor: United States. Social Security BoardReleased on Project Gutenberg: August 1, 2005
- See America FirstAuthor: Hiestand, Orville O., Herr, Charles J.Released on Project Gutenberg: November 1, 2002
- Seeing Europe with Famous Authors, Volume 1: Great Britain and Ireland, part 1Author: Francis W. (Francis Whiting) HalseyReleased on Project Gutenberg: January 1, 2004
- Seeing Europe with Famous Authors, Volume 2: Great Britain and Ireland, Part 2Author: Francis W. (Francis Whiting) HalseyReleased on Project Gutenberg: July 1, 2005
- Seeing Europe with Famous Authors, Volume 3: France and the Netherlands, Part 1Author: Francis W. (Francis Whiting) HalseyReleased on Project Gutenberg: July 1, 2005
- Seeing Europe with Famous Authors, Volume 4: France and the Netherlands, Part 2Author: Francis W. (Francis Whiting) HalseyReleased on Project Gutenberg: April 1, 2004
- Seeing Europe with Famous Authors, Volume 5: Germany, Austria-Hungary, and Switzerland, Part 1Author: Francis W. (Francis Whiting) HalseyReleased on Project Gutenberg: May 1, 2004
- Seeing Europe with Famous Authors, Volume 6: Germany, Austria-Hungary and Switzerland, part 2Author: Francis W. (Francis Whiting) HalseyReleased on Project Gutenberg: February 1, 2004
- Seeing Europe with Famous Authors, Volume 7: Italy, Sicily, and Greece (Part One)Author: Francis W. (Francis Whiting) HalseyReleased on Project Gutenberg: July 16, 2006
- Seeing Europe with Famous Authors, Volume 8: Italy, Sicily, and Greece, Part TwoAuthor: Francis W. (Francis Whiting) HalseyReleased on Project Gutenberg: August 16, 2006
- Seekers after GodAuthor: F. W. (Frederic William) FarrarReleased on Project Gutenberg: January 1, 2004
- Seen and UnseenAuthor: Bates, E. Katherine (Emily Katherine)Released on Project Gutenberg: April 12, 2007
- Sejanus: His FallAuthor: Jonson, BenReleased on Project Gutenberg: March 1, 2004
- Select Epigrams from the Greek AnthologyAuthor: J. W. (John William) MackailReleased on Project Gutenberg: October 1, 2000
- Select Poems of Sidney LanierAuthor: Sidney Lanier, Morgan CallawayReleased on Project Gutenberg: March 1, 1998