History of the Encyclopædia Britannica the criteria by which the articles were sorted were not obvious even to scholars, despite Dr. Adler's claims that the sorting followed naturally from the "Propædia's" outline of all knowledge. In 1985, the "Britannica" responded to reader requests by restoring the index as a two-volume set. The number of topics indexed by the "Britannica" has fluctuated from 500,000 (1985, the same as in 1954) to 400,000 (1989,1991) to 700,000 in the current 2007 print version. Presumably, this recent increase reflects the introduction of efficient electronic indexing, since the size of the encyclopedia has remained nearly constant at approximately 40 million
Online encyclopedia varies from proof read, to poor quality text with many optical character recognition (OCR) errors. Many encyclopaedias are available at the Internet Archive. Although the original text is viewable the machine readable text is often poor with may OCR errors. In January 1995, Project Gutenberg started to publish the ASCII text of the "Encyclopædia Britannica", 11th edition (1911), but disagreement about the method halted the work after the first volume. For trademark reasons this has been published as the "Gutenberg Encyclopedia". Project Gutenberg has restarted work on digitising and proofreading this encyclopedia; as of June 2005 it had not yet