The oldest substantial encyclopedia is Zedler's Universal-Lexikon. (There are also a handful of shortish, single-volume encyclopedias dating from about 1709 onwards). Zedler appeared in 64 volumes (plus a 4-volume supplement) between 1732 and 1754. It was published by Johann Heinrich Zedler and appeared in Leipzig and Halle (in Germany). Most of the contributions were written by professors at these two universities. As is customary the articles are anonymous. Despite the fact that the work contains some plagiarism and a number of errors, it was a very remarkable achievement and represented a substantial investment. Joncey
Golden Book Encyclopedia was created in 1959.
Catholic Encyclopedia was created in 1907.
Croatian Encyclopedia was created in 1999.
The Otaku Encyclopedia was created in 2009.
Encyclopedia Brunoniana was created in 1993.
Encyclopedia of Conifers was created in 2012.
Mining Encyclopedia was created in 1998.
Encyclopedia of Earth was created in 2006.
Hutchinson Encyclopedia was created in 1948.
Doosan Encyclopedia was created in 1982.
Encyclopedia of China was created in 1978.
Encyclopedia Rizaliana was created in 2008.