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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- %s (8 members)
- ' .. cat .. ' (1 member)
- ' .. error category .. ' (1 member)
- 1642 births (1 member)
- 1727 deaths (1 member)
- 17th-century English mathematicians (1 member)
- 17th-century English writers (1 member)
- 17th-century Latin-language writers (1 member)
- 1831 births (1 member)
- 1847 births (1 member)
- 1852 births (1 member)
- 1853 births (1 member)
- 1854 births (1 member)
- 1858 births (1 member)
- 1864 births (1 member)
- 1876 introductions (1 member)
- 1878 introductions (1 member)
- 1879 deaths (1 member)
- 1887 in science (1 member)
- 18th-century British scientists (1 member)
- 18th-century English mathematicians (1 member)
- 18th-century English writers (1 member)
- 18th-century Latin-language writers (1 member)
- 1909 deaths (1 member)
- 1912 deaths (1 member)
- 1917 births (1 member)
- 1920 births (1 member)
- 1927 births (1 member)
- 1928 births (1 member)
- 1928 deaths (1 member)
- 1931 deaths (2 members)
- 1947 deaths (1 member)
- 1980 books (1 member)
- 1990 deaths (1 member)
- 1992 deaths (1 member)
- 1995 photographs (1 member)
- 19th-century American businesspeople (1 member)
- 19th-century British mathematicians (1 member)
- 19th-century French mathematicians (1 member)
- 19th-century German mathematicians (1 member)
- 19th-century Scottish people (1 member)
- 19th-century inventors (1 member)
- 19th-century physicists (2 members)
- 2004 deaths (1 member)
- 2013 deaths (1 member)
- 20th-century American businesspeople (1 member)
- 20th-century American philosophers (1 member)
- 20th-century American scientists (2 members)
- 20th-century British scientists (1 member)
- 20th-century French philosophers (1 member)