Twentieth century

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

• Twentieth century -- Fiction
• Twentieth century -- Forecasts
• Civilization, Modern -- 20th century
• Nineteen twenties

• 20th century
• 1900s (Century)
• Nineteen hundreds (Century)

• Caesar's Column (Caesars Soile): En Beretning fra det Tyvende Aarhundrede (in Norwegian; Chicago, F.J. Shulte and Co., 1892), by Ignatius Donnelly (multiple formats at archive.org)
• Caesar's Column: A Story of the Twentieth Century (Chicago, F.J. Shulte and Co., c1890), by Ignatius Donnelly
  • HTML with commentary at sacred-texts.com
  • multiple formats at archive.org
  • Gutenberg text
• Caesars Klonn: En Berattelse fran Tjugonde Arhundradet (in Swedish; Chicago: Swedish Book Co., 1891), by Ignatius Donnelly, trans. by Jakob Bonggren (multiple formats at archive.org)

• The Wild Body: A Soldier of Humour, and Other Stories (c1927), by Wyndham Lewis (HTML in Canada; NO US ACCESS)

• The Island of Anarchy: A Fragment of History in the 20th Century (Reading, UK: Pub. by Miss Langley, Lovejoy's Library, 1887), by Elizabeth Waterhouse
  • multiple formats at Google; US access only
  • multiple formats at archive.org

• Anticipations of the Reaction of Mechanical and Scientific Progress upon Human Life and Thought (second edition; London: Chapman and Hall, 1902), by H. G. Wells (Gutenberg text)
• The Case of The. Fox, Being His Prophecies, Under Hypnotism, of the Period Ending A.D. 1950: A Political Utopia (author may be misidentified on cover page; London: Truslove and Hanson, 1903), by William Ford Stanley (multiple formats at archive.org)
• The Decline and Fall of the British Empire: A Brief Account of Those Causes Which Resulted in the Destruction of Our Late Ally, Together with a Comparison Between the British and Roman Empires; Appointed for Use in the National Schools of Japan (purported to be published in Tokyo in 2005; Oxford: Alden and Co.; London: Simpkin, Marshall, Hamilton, Kent and Co., ca. 1905), by Elliott Evans Mills
  • multiple formats at archive.org
  • page images at HathiTrust; US access only
• The English Revolution of the Twentieth Century: A Prospective History (second edition; London: F. L. Balin, 1897), by Henry Lazarus (multiple formats at archive.org)
• Global 2000 Revisited: What Shall We Do?, by Gerald O. Barney, contrib. by Jane Blewett and Kristen R. Barney (HTML and PDF at millenniuminstitute.net)
• The Liberators: A Story of Future American Politics (New York: B. W. Dodge and Co., 1908), by Isaac Newton Stevens, illust. by Nella Fontaine Binckley (multiple formats at archive.org)
• Looking Forward: A Dream of the United States of the Americas in 1999 (Utica, NY: Press of L. C. Childs, c1899), by Arthur Bird
  • multiple formats at archive.org
  • page images at HathiTrust
• Memoirs of the Twentieth Century ("Vol. I" was the only volume published; London: Osborn et al., 1733), by Samuel Madden (multiple formats at Google)

• Beyond Modernization: Chinese Roots for Global Awareness, ed. by Wang Miaoyang, Yu Xuanmeng, and George F. McLean (HTML at crvp.org)
• The New Dark Ages Conspiracy: Britain's Plot to Destroy Civilization, by Carol Schitzner White (PDF at wlym.com)
• The Salvaging of Civilization (London et al.: Cassell and Co., 1921), by H. G. Wells (Gutenberg text)

• The XXth Century, ed. by Klaus Mehnert (full serial archives)

• The Origin and Its Meaning, by Roger Ellman (PDF files at the-origin.org)

• Echoes From Labor's War: Industrial Cape Breton in the 1920s (introduction and poems), by Dawn Fraser (HTML with commentary at socialisthistory.ca)

Items below (if any) are from related and broader terms.