Fourth dimension

Here are entered philosophical and imaginative works. Mathematical works are entered under Hyperspace.

See also what's at Wikipedia, your library, or elsewhere.

• Mathematics

• Time travel

• Space and time

• Space of more than three dimensions

• Another World; or, the Fourth Dimension, by A. T. Schofield (text in Sweden)
• An Episode of Flatland: or, How a Plane Folk Discovered the Third Dimension (London: Swan Sonnenschein and Co., 1907), by Charles Howard Hinton (HTML at Forgotten Futures)
• Flatland (second edition), by Edwin A. Abbott
  • illustrated HTML at Eldritch Press
  • Gutenberg text with ASCII illustrations
• Four-Dimensional Vistas, by Claude Fayette Bragdon (Gutenberg text)
• The Fourth Dimension Simply Explained, ed. by Henry Parker Manning (illustrated HTML at Virginia)
• A New Era of Thought (London: Swan Sonnenschein and Co., 1888), by Charles Howard Hinton, Alicia Boole Stott, and H. John Falk (multiple formats at archive.org)
• A Primer of Higher Space (The Fourth Dimension) (Rochester, NY: The Manas Press, 1913), by Claude Fayette Bragdon
  • page images at HathiTrust
  • multiple formats at archive.org
• Scientific Romances: First Series (London: S. Sonnenschein and Co., 1886), by Charles Howard Hinton (multiple formats at archive.org)
• Selected Writings on the Fourth Dimension, by Charles Howard Hinton (HTML at Eldritch Press)
• Tertium Organum, The Third Canon of Thought: A Key to the Enigmas of the World (second American edition; New York: Alfred A. Knopf, 1922), by P. D. Uspenskii, trans. by Nicholas Bessaraboff and Claude Fayette Bragdon (HTML at sacred-texts.com)

• Basic Properties of Matter (Portland, OR: North Pacific Publishers, 1988), by Dewey B. Larson (HTML at reciprocalsystem.com)
• The Neglected Facts of Science (Portland, OR: North Pacific Publishers, 1982), by Dewey B. Larson (HTML with commentary at reciprocalsystem.com)
• New Light on Space and Time (Portland, OR: North Pacific Publishers, 1965), by Dewey B. Larson (illustrated HTML at reciprocalsystem.com)
• Space, Time and Gravitation: An Outline of the General Relativity Theory (Cambridge: At the University Press, 1920), by Arthur Stanley Eddington (Gutenberg PDF and LaTeX)
• Time and Free Will: An Essay on the Immediate Data of Consciousness, by Henri Bergson, trans. by Frank Lubecki Pogson (multiple formats at archive.org)
• The Universe of Motion (Portland, OR: North Pacific Publishers, 1984), by Dewey B. Larson (HTML at reciprocalsystem.com)

• Puck of Pook's Hill (London: Macmillan and Co., 1911), by Rudyard Kipling, illust. by H. R. Millar (Gutenberg text and illustrated HTML)
• Puck of Pook's Hill (New York: Doubleday, Page, and Co., 1906), by Rudyard Kipling, illust. by Arthur Rackham (Gutenberg text, illustrated HTML, and page images)
• A Romance of Two Worlds, by Marie Corelli
  • volume 1: HTML at Indiana
  • volume 2: HTML at Indiana
  • Gutenberg text

• 1632, by Eric Flint (multiple formats at freedoors.org)
• 1633, by David Weber and Eric Flint (multiple formats at freedoors.org)
• 1634: The Baltic War (included on a Baen CD image; c2007), by Eric Flint and David Weber
  • zipped CD ISO at thefifthimperium.com; 196 MB
  • zipped CD files at thefifthimperium.com; 195 MB
• 1634: The Bavarian Crisis (included on a Baen CD image; c2007), by Eric Flint and Virginia Easley DeMarce
  • zipped CD ISO at thefifthimperium.com; 347 MB
  • zipped CD files at thefifthimperium.com; 347 MB
• 1634: The Galileo Affair (included on a Baen CD image; c2004), by Eric Flint and Andrew Dennis
  • zipped CD ISO at thefifthimperium.com; 196 MB
  • zipped CD files at thefifthimperium.com; 195 MB
• 1635: The Cannon Law (included on a Baen CD image; c2006), by Eric Flint and Andrew Dennis
  • zipped CD ISO at thefifthimperium.com; 196 MB
  • zipped CD files at thefifthimperium.com; 195 MB
• 1635: The Dreeson Incident (included on a Baen CD image; c2008), by Eric Flint and Virginia Easley DeMarce
  • zipped CD ISO at thefifthimperium.com; 347 MB
  • zipped CD files at thefifthimperium.com; 347 MB
• 1635: The Tangled Web (included on a Baen CD image; c2009), by Virginia Easley DeMarce, contrib. by Eric Flint
  • zipped CD ISO at thefifthimperium.com; 347 MB
  • zipped CD files at thefifthimperium.com; 347 MB
• Anthem, by Ayn Rand
  • Gutenberg text; access from USA only
  • Gutenberg text comparing editions; access from USA only
• The Big Time (as published in Galaxy Magazine, 1958), by Fritz Leiber, illust. by Virgil Finlay (Gutenberg text and illustrated HTML)
• The British Barbarians, by Grant Allen (Gutenberg text)
• The British Barbarians: A Hill-Top Novel (London, New York: J. Lane; G.P. Putnam's Sons, 1895), by Grant Allen (multiple formats at archive.org)
• City at World's End, by Edmond Hamilton (multiple formats at manybooks.net)
• A Connecticut Yankee in King Arthur's Court (vol. 16 of The Writings of Mark Twain; New York: Harper and Brothers, c1899), by Mark Twain (illustrated HTML at Virginia)
• A Connecticut Yankee in King Arthur's Court (New York: Charles L. Webster and Company, 1889), by Mark Twain (Gutenberg text and illustrated HTML)
• Darkness and Dawn, by George Allan England (Gutenberg text)
• The Eternal Lover (original magazine version; includes section published originally as "Sweetheart Primeval"; see also The Eternal Savage), by Edgar Rice Burroughs (illustrated HTML at erblist.com)
• The Excalibur Alternative (included on a Baen CD image), by David Weber
  • zipped CD ISO at thefifthimperium.com; 151 MB
  • zipped CD files at thefifthimperium.com; 152 MB
• Far Edge of Darkness, by Linda Evans (HTML at Baen Ebooks)
• Grantville Gazette IV (included on a Baen CD image; c2008), ed. by Eric Flint
  • zipped CD ISO at thefifthimperium.com; 347 MB
  • zipped CD files at thefifthimperium.com; 347 MB
• The Heads of Cerberus (originally published 1919), by Francis Stevens (HTML at Gutenberg Australia)
• Ladies Whose Bright Eyes: A Romance (London: Constable and Co., 1919), by Ford Madox Ford (multiple formats at archive.org)
• Light Ahead for the Negro (New York: Grafton Press, c1904), by Edward A. Johnson (multiple formats at archive.org)
• The Lion of Farside, by John Dalmas (HTML at Baen Ebooks)
• Looking Backward, by Edward Bellamy (multiple editions)
• The People of the Ruins: A Story of the English Revolution and After (New York: F. A. Stokes Co., c1920), by Edward Shanks
  • multiple formats at archive.org
  • page images at HathiTrust
• Ring of Fire, ed. by Eric Flint (multiple formats at freedoors.org)
• Ring of Fire II (included on a Baen CD image; 2008), ed. by Eric Flint
  • zipped CD ISO at thefifthimperium.com; 347 MB
  • zipped CD files at thefifthimperium.com; 347 MB
• The Sleeper Awakes, by H. G. Wells (Gutenberg text)
• The Sorceress of Karres (included on a Baen CD image; c2010), by Eric Flint and Dave Freer
  • zipped CD ISO at thefifthimperium.com; 347 MB
  • zipped CD files at thefifthimperium.com; 347 MB
• The Time Machine, by H. G. Wells
  • HTML at Virginia
  • HTML at Bartleby
  • Gutenberg text
• Time Spike (included on a Baen CD image; c2008), by Eric Flint and Marilyn Kosmatka
  • zipped CD ISO at thefifthimperium.com; 347 MB
  • zipped CD files at thefifthimperium.com; 347 MB
• Time Traders (combined edition with Galactic Derelict), by Andre Norton (multiple formats at Baen Free Library)
• The Time Traders (Cleveland and New York: World Publishing Company, c1958), by Andre Norton
  • Gutenberg text
  • page images at durendal.org
• A Week in the Future (originally serialized in The Centennial Magazine, 1888-1889), by Catherine Helen Spence (HTML at Gutenberg Australia)
• When the Sleeper Wakes, by H. G. Wells (Gutenberg text)

More items available under narrower terms.