1900s 1900 International Encyclopaedia and Dictionary (1900) - a descendant of the Popular Encyclopedia or Conversations Lexicon (1841) International dictionary and cyclopaedia (1901) Imperial Dictionary and Cyclopaedia (1901) New Popular Encyclopaedia British ed. (1901), based on Blackie's Modern Cyclopaedia of Universal Information (1889) itself based on Popular Encyclopedia or Conversations Lexicon (1841) Modern Encyclopaedia of Universal Information British ed. (1906) XXth century Cyclopaedia and Atlas (1901) - a reissue of New Cabinet Cyclopaedia and Treasury of Knowledge (1891), itself based on Blackie's Modern Cyclopaedia of Universal Information (1889) New Twentieth Century Cyclopaedia (1903) New and Complete Universal Self-Pronouncing Dictionary (1905) New Cosmopolitan Encyclopaedia (1906) National Encyclopedia of Reference (1912) The Nuttall Encyclopædia (1900) Standard American Book of Knowledge (1900) - a reissue of Standard Cyclopedia (1897) 20th Century Cyclopedia of Universal Knowledge (1901) World's Book of Knowledge (1901) New Century Cyclopedia of Universal Knowledge (1902) American Educator and Library of Knowledge (1902) Standard Library of Knowledge (1904) Student's Cycopaedia (1900) Student's Reference Work (1903) New Student's Reference Work (1909) How and Why Library (1913) This was a supplement to the above that, in 1934, was acquired by another company and spun off into a new work. Later incorporated into Childcraft. Modern American Encyclopedia (1934) Universal Cyclopaedia (1900) - a reissue of Johnson's New Universal Cyclopaedia (1876) Universal Reference Library (1900) a reissue of Universal Cyclopaedia and Dictionary edited by Charles Morris (1898) Twentieth Century Encyclopedia (1901) Imperial Reference Library (1901) Current Cyclopedia of Reference (1909)
1901 Century Dictionary and Cyclopedia (1901) - a reissue of the Century Dictionary (1889) Current Encyclopedia (July 1901 - April 1902?) an attempt at a "periodical" reference work. Later merged with Progress to form The World To-Day. Handy Cyclopedia of Common Things and Biographical Dictionary (1901) Twentieth Century Cyclopedia of Practical Knowledge (1901) Hill's Practical Encyclopedia (1901) School Library Encyclopedia (1901) Hill's Practical Reference Library (1902) New Practical Reference Library (1907) American Educator (1919) Dominion Educator (1919) Canadian ed. New General Encyclopedia (1935) Canadian ed. Popular Compendium of Useful Information (1901) a one volume reference work edited by Charles Smith Morris Twentieth Century Cyclopedia of Useful Information (1901) World Encyclopaedia (1901) Golden Treasury of Useful Information (1902) Worlds Best Information and How to Use It (1902) Home Cyclopedia of Useful Knowledge (1902) Home Educator in Necessary Knowledge (1905) Everybody's Encyclopedia for Everyday Reference (1907) Cyclopedia, Dictionary and Atlas of the World (1909)
1902 Anglo-American Encyclopedia and Dictionary (1902) - an unauthorized reprint of portions of the Encyclopedia Britannica with an unrelated dictionary attached. (Link includes vols. 2-4, 6-9, 11-12) New American Comprehensive Encyclopedia (1906) (Link includes vols. 1, 3 and 4) Century Book of Facts (1902) a quasi-annual one volume work Universal Manual of Ready Reference (1904) New Century Book of Facts (1909) Collier's New Encyclopedia (1902) University Encyclopaedia of Twentieth Century Knowledge (1902) Encyclopedia Americana (1902) New International Encyclopedia (1902) Teacher's and Pupil's Cyclopaedia (1902) Encyclopedic Current Reference (1906) New Teacher's and Pupil's Cyclopaedia (1910) Unrivaled Encyclopedia (1911) Practical American Encyclopedia (1911) International Reference Work (1923) Progressive Reference Library (1928) World Scope Encyclopedia (1945) New World Family Encyclopedia (1953) Standard International Encyclopedia (1953) New American Encyclopedia (1964) World University Encyclopedia (1964) World Educator Encyclopedia (1964)
1903 Crown Encyclopaedia and Gazetter (1903) (Link includes vols. 1 and 5) Continental Encyclopedia (1905) New Century Reference Library (1907) (Link includes vols. 2-8) Current Cyclopedia of Reference (1909) Everybody's Encyclopedia (1910) People's Encyclopedia (1914) New World Wide Encyclopedia (1918) World Wide Encyclopedia (1919) New World Encyclopedia (1919) (Link includes vol. 1) Adair's New Encyclopedia (1923) (Link includes vols. 2-5) Time's Encyclopedia and Gazetteer (1929) Twentieth Century Encyclopedia (1930) Worlds Popular Encyclopedia (1937) Imperial Encyclopedia and Dictionary (1903), a continuation of Columbian Cyclopaedia (1899) New Imperial Encyclopedia and Dictionary (1906) United Editors Encyclopedia and Dictionary (1909) United Editors Perpetual Encyclopedia (1911) New People's Cyclopedia of Universal Knowledge (1903) (Link includes vols. 1-4) re-issue of People's Cyclopedia of Universal Knowledge (1883) World Wide Encyclopedia and Gazetteer (1908) Twentieth Century Household Library (1903)
1904 Cassells Cabinet Cyclopedia (1904) Complete Library of Universal Knowledge (1904) New Idea Self-Instructor (1904) The Knowledge Book (1915) The Knowledge Library (1918) New Knowledge Library (1919) Modern Achievement (1904)
1905
Everybody's Everyday Reference Book for Home and Office (1905) Pannell's Reference Book for Home and Office (1905) Jack's Reference Book for Home and Office (1908) Everett's encyclopedia of useful knowledge (1905) Columbia Encyclopedia of Useful Knowledge (1907) American Home Encyclopedia of Useful Knowledge (1908)
1906 Nelson's Encyclopaedia (1906) Harmsworth's Encyclopaedia (1906) British edition Nelson's Perpetual Loose Leaf Encyclopaedia (1913) New Age Encyclopedia (1920) Harmsworth's Universal Encyclopaedia (1920) British edition Doubleday Encyclopedia (1931), American ed. based on above Grolier Encyclopedia (1940) Unified Encyclopedia (1960) Concise Universal Encyclopedia (1930), a condensed British revision of Harmworth's Universal Modern Encyclopedia (1933) British re-issue of the above New Popular Educator (1933) British re-issue of the above Casell's Modern Encyclopedia (1934) British re-issue of the above Encyclopedia of Modern Knowledge (1936) British revision of Harmworth's Universal New Universal Encyclopedia (1951) Nelson's Complete Encyclopedia (1937) Nelson's Encyclopaedia: Unabridged (1940) Nelson's New Loose Leaf Encyclopaedia (1940) Book of Knowledge (1959) British ed. American People's Encyclopedia (1948) New Standard Encyclopedia (1906) May or may not have derived from Standard American Encyclopedia (1899) Practical and Home Encyclopedia (1909) Standard American Encyclopedia (1912) International's World Reference Encyclopedia (1942) Universal World Reference Encyclopedia (1945)
1907 Everyone's Cyclopedia (1907) Library of Original Sources (1907)
1908
The Children's Encyclopædia (1908) Book of Knowledge (1912) American revision of the Children's Encyclopaedia New Book of Knowledge (1966) later iteration of the Book of Knowledge Standard Dictionary of Facts (1908)
1909 La Salle Extension University Encyclopedia (1909) Everybody's Encyclopedia (1909) Webster's Universal Encyclopedia (1909) Modern Universal Encyclopedia (1910) Home and Office Reference Book of Facts (1913) New Complete Condensed Encyclopedia (1909), a re-issue of Chandler's Encyclopedia (1898) Werner Encyclopedia (1909), a reprint of the 9th edition of the Britannica. Anglo-American Encyclopedia (1911) Winston's Encyclopedia (1909) Winston's Cumulative Loose Leaf Encyclopedia (1912) Encyclopedia Library (1942) American International Encyclopedia (1950)
1910s 1910 Aiton's Encyclopedia (1910) Standard Reference Work (1912) National Encyclopedia for the Home, School and Library (1923) New Standard Encyclopedia (1930) Consolidated Encyclopedia (1939) Canadian ed. Appleton's New Practical Encyclopedia (1910) New Universal Encyclopedia (1930) Routledge's Everyman's Encyclopedia (1910)
1911 Handy Cyclopedia of Things Worth Knowing (1911) Volume Library (1911) (Returned to original title in 1970) Cowles Comprehensive Encyclopedia: the Volume Library (1963) Cowles Volume Library (1968)
1912 Modern Encyclopedia (1912) Standard Illustrated Book of Facts (1912)
1913
Funk and Wagnall's Standard Encyclopedia of the Worlds Knowledge (1913) Everyman's Encyclopaedia (1913-4) Cambridge Encyclopedia (1934) Canadian ed. Macmillan Everymans Encyclopedia (1958) Home and School Reference Work (1913) Source Book (1924) American Reference Library (c.1931). Other recorded names included National Encyclopedia, Perpetual Loose Leaf Encyclopedia and North American Reference Book New Encyclopedia (1913)
1914 Human Interest Library (1914) New Human Interest Library (1928) Our Wonder World (1914) New Wonder World (1932) New Wonder World Encyclopedia (1959) New Wonder World Cultural Library (1962) Cultural Library (1964) Stokes Complete One Volume Encyclopedia (1914)
1916 Circle of Knowledge (1916) Pictured Knowledge 1916
1917
World Book Encyclopedia (1917)
1919
Bufton's Universal Cyclopedia (1919) Library of Knowledge (1929)
1920s 1920 Encyclopedia Americana (1920) New Universal Handbook of Necessary Information (1920) Universal Handbook (1920s) Winston Universal Reference Library (1930) Waverley New Era Encyclopedia (1920) Waverley Encyclopedia of General Information (1930)
1921 New Gresham Encyclopedia (1921-4) Compact Encyclopedia (1927) Concise Encyclopedia (1933) also referred to as the Collins Concise Encyclopedia The British Encyclopedia (1933) Collins Gem Encyclopedia (1979) Running Press Encyclopedia (1993)
1922 Compton's Encyclopedia (1922) Book of Knowledge (1922) British ed. Returned to this title in 1959 Cassell's Book of Knowledge Waverley Book of Knowledge Hammerton Book of Knowledge Wonderland of Knowledge (1933) New Book of Knowledge (1938-1953)
1924
Lincoln Library of Essential Information (1924) Encyclopedia of World Knowledge (1969) New Lincoln Library Encyclopedia (1978) Outline of Knowledge (1924) Link only goes to Vol. 1 New Outline of Knowledge (1936)
1925 Concise Pocket Encyclopedia (1925)
1927 Universal Knowledge (1927)
1928 I See All (1928) New Universities Encyclopedia (1928)
1929
Pocket Library of the Worlds Essential Information (1929)
1930s
1930 American Home Library (1930)
1931 Funk and Wagnall's New Standard Encyclopedia of Universal Knowledge (1931) New Funk and Wagnall's Encyclopedia (1949) Universal Standard Encyclopedia (1954) Funk and Wagnall's Standard Reference Encyclopedia (1959) Funk & Wagnalls New Encyclopedia (1971) Golden Pathway to Knowledge (1931) Hayward's Key to Knowledge (1931) An Outline of Modern Knowledge (1931)
1932
National Encyclopedia (1932) Newnes Pictorial Encyclopedia (1932) New Standard Encyclopedia and World Atlas (1932) Wonder World of Knowledge (1935) Wonder World Encyclopedia (1936) Standard Encyclopaedia (1937) Modern Standard Encyclopedia (1938) New Wonder World Encyclopedia (1964)
1933
Modern Encyclopaedia (1933) 1 vol. Concise Encyclopaedia (1937) 8 vols. Modern Concise Encyclopaedia (1940) 12 vols. New Modern Encyclopaedia (1943) 1 vol. Modern Encyclopedia for Children (1933) Wonder Encyclopedia for Children (1933) Golden Encyclopedia for Children (1934) Clear Type Encyclopedia (1935) Laural and Gold Encyclopedia (1935) Modern Encyclopedia for Young People (1935) Modern Illustrated Encyclopedia (1940) Newes Everything Within (1933) Newnes Golden Treasury (1933) Children's Everything Within (1939) New Illustrated Universal Reference Book (1933) Richards Cyclopedia (1933) Richard's Topical Cyclopedia (1939)
1934 Daily Express Encyclopedia (1934) Routledge's Universal Encyclopedia (1934) British ed. Facts; the New Concise Encyclopedia (1934) American ed. New Concise Pictorial Encyclopedia (1938) Comprehensive Pictorial Encyclopedia (1942) World Home Reference Encyclopedia (1951)