• Encyclopaedia Britannica: or, A Dictionary of Arts and Sciences, Compiled Upon a New Plan, in Which the Different Sciences and Arts Are Digested Into Distinct Treatises or Systens, and the Various Technical Terms, &c. Are Explained As They Occur in the Order of the Alphabet (first edition, 3 volumes; Edinburgh: Printed for A. Bell and C. Macfarquhar, 1771), by Society of Gentlemen in Scotland, ed. by William Smellie
  • page images at National Library of Scotland
  • page images at HathiTrust
• Encyclopaedia Britannica: or, A Dictionary of Arts and Sciences, Compiled Upon a New Plan, in Which the Different Sciences and Arts Are Digested Into Distinct Treatises or Systens, and the Various Technical Terms, &c. Are Explained As They Occur in the Order of the Alphabet (first edition reprint, 3 volumes; London: Printed for J. Donaldson, 1773), by Society of Gentlemen in Scotland, ed. by William Smellie (page images at National Library of Scotland)

• Encyclopaedia Britannica: or, A Dictionary of Arts, Sciences, &c, on a Plan Entirely New (second edition, 10 volumes; Edinburgh: Printed for J. Balfour et al., 1778-1783), ed. by James Tytler, illust. by Andrew Bell (page images at National Library of Scotland)

• Encyclopaedia Britannica: or, A Dictionary of Arts, Sciences, and Miscellaneous Literature (3rd edition, 18 volumes of text and 2 volumes of plates; Edinburgh: Printed for A. Bell and C. Macfarquhar, 1797), ed. by Colin MacFarquhar and George Gleig, illust. by Andrew Bell (multiple formats at archive.org)

• Encyclopaedia Britannica: or, A Dictionary of Arts, Sciences, and Miscellaneous Literature (4th edition, 20 volumes; Edinburgh: Printed by A. Bell, 1810), ed. by James Millar (multiple formats at archive.org and elsewhere)

• Encyclopaedia Britannica: or, A Dictionary of Arts, Sciences, and Miscellaneous Literature (5th edition, 20 volumes; Edinburgh: Printed at the Encyclopaedia Press for A. Constable and Co., et al., 1815), ed. by James Millar (page images at National Library of Scotland)

We also list an 1824 supplement to this edition.

• Encyclopaedia Britannica: or, A Dictionary of Arts, Sciences, and Miscellaneous Literature (6th edition, 20 volumes; Edinburgh: Printed by A. Constable and Co., 1823), ed. by Charles Maclaren (page images at HathiTrust; includes some supplement volumes)

• The Encyclopaedia Britannica: or, Dictionary of Arts, Sciences, and General Literature (7th edition, 21 volumes; Edinburgh: A. and C. Black, 1842), ed. by Macvey Napier (page images at HathiTrust)

• The Encyclopaedia Britannica: or, Dictionary of Arts, Sciences, and General Literature (8th edition, 21 volumes plus 22nd index volume; Edinburgh: A. and C. Black, 1853-1860), ed. by Thomas Stewart Traill
  • page images at National Library of Scotland
  • page images at HathiTrust

This was the last edition published before British books were eligible for US copyright protection. Authorized American editions were published by Scribner's, by Little, Brown and Co., and by Samuel Hall. These were nearly identical to the British edition, and some US sets mix volumes from these publishers. There were also unauthorized editions from other publishers, some of which include revised or added material.

• The Encyclopaedia Britannica: A Dictionary of Arts, Sciences, and General Literature (9th edition, 24 volumes plus 25th index volume; Edinburgh: A. and C. Black, 1875-1889), ed. by T. Spencer Baynes and W. Robertson Smith (page images at National Library of Scotland)
• The Encyclopaedia Britannica, a Dictionary of Arts, Sciences, and General Literature: The R. S. Peale Reprint, With New Maps and Original American Articles by Eminent Writers, With American Revisions and Additions (American revision of the 9th Britannica edition; 25 volumes; Chicago: The Werner Co., 1893), contrib. by W. H. De Puy, T. Spencer Baynes, and W. Robertson Smith (page images at HathiTrust)

• The New Volumes of the Encyclopaedia Britannica: Constituting in Combination with the Existing Volumes of the Ninth Edition, the Tenth Edition of That Work, and Also Supplying a New, Distinctive, and Independent Library of Reference Dealing With Recent Events and Developments (11 new volumes; London and Edinburgh: A. and C. Black; London: "The Times", 1902-1903), ed. by Donald Mackenzie Wallace, Arthur Twining Hadley, and Hugh Chisholm
  • all 11 new volumes (25-35): page images at National Library of Scotland
  • Volumes 1-24 (from the 9th edition of 1875-1889): page images at National Library of Scotland
• The New Volumes of the Encyclopaedia Britannica: Constituting in Combination with the Existing Volumes of the Ninth Edition, the Tenth Edition of That Work, and Also Supplying a New, Distinctive, and Independent Library of Reference Dealing With Recent Events and Developments (11 new volumes; London and Edinburgh: A. and C. Black; New York: Encyclopaedia Britannica Co., 1902-1903), ed. by Donald Mackenzie Wallace, Arthur Twining Hadley, and Hugh Chisholm
  • Volume 25 (new volume 1: Aachen - Australia): multiple formats at archive.org
  • Volume 26 (new volume 2: Austria-Hungary - Chicacole): multiple formats at archive.org
  • Volume 27 (new volume 3: Chicago - Elduayen): multiple formats at archive.org
  • Volume 28 (new volume 4: Elections - Glamorgan): multiple formats at archive.org
  • Volume 29 (new volume 5: Glarus - Jutland): multiple formats at archive.org
  • Volume 30 (new volume 6: Kabadian - Morvi): multiple formats at archive.org
  • Volume 31 (new volume 7: Mosaic - Prevesa): multiple formats at archive.org
  • Volume 32 (new volume 8: Probiloff Islands - Stowmarket): multiple formats at archive.org
  • Volume 33 (new volume 9: Strachey - Zwolle): multiple formats at archive.org
  • Volume 34 (new volume 10: Maps): page images at HathiTrust; US access only
  • Volume 35 (index of volumes 1-34): multiple formats at archive.org
  • all 11 new volumes (25-35): page images at HathiTrust; US access only
  • Volumes 1-24 (from the 9th edition of 1875-1889, British printing): page images at National Library of Scotland

This edition, the last complete revision fully in the US public domain, is a favorite for reprints and online editions.

• The Encyclopaedia Britannica: A Dictionary of Arts, Sciences, Literature and General Information (11th edition, 1910-1911), ed. by Hugh Chisholm (multiple formats at archive.org, Gutenberg, and (US access only) HathiTrust)

• The Encyclopaedia Britannica: The New Volumes, Constituting, in Combination With the Twenty-Nine Volumes of the Eleventh Edition, the Twelfth Edition of That Work, and Also Supplying a New, Distinctive, and Independent Library of Reference Dealing With Events and Developments of the Period 1910 to 1921 Inclusive (3 volumes; London: Encylopaedia Britannica Co.; New York: Encylopaedia Britannica, Inc., 1922), ed. by Hugh Chisholm
  • all 3 new volumes: page images at HathiTrust; US access only
  • Volume 30 (first new volume, Abbe - English History): multiple formats at archive.org
  • Volume 31 (second new volume, English Literature - Oyama, Iwao): multiple formats at archive.org
  • Volume 32 (third new volume, Pacific Ocean Islands - Zuloaga): multiple formats at archive.org
  • Volumes 1-29 (from the 11th edition of 1910-1911): multiple formats at archive.org and Gutenberg

• The Encyclopaedia Britannica, a Dictionary of Arts, Sciences, Literature and General Information: The Three New Supplementary Volumes, Constituting With the Volumes of the Latest Standard Edition, the Thirteenth Edition (3 volumes; London: Encylopaedia Britannica Co.; New York: Encylopaedia Britannica, Inc., 1926), ed. by J. L. Garvin
  • all 3 new volumes: multiple formats at archive.org
  • prior standard edition (the 11th edition of 1910-1911): multiple formats at archive.org and Gutenberg

• Look for editions of this book at your library, or elsewhere.