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“The 20th century of Earth's calendar, commonly defined as ranging from the year 1900 to the year...20th century
“The 1900s was, on Earth's calendar, the first decade of the 20th century. Although this was a...1900s
“1910, 1911, 1912, 1913, 1914, 1915, 1916, 1917, 1918, 1919, 1920 1910s article at Memory Alpha...1910s
“The 1980s was, on Earth's calendar, the ninth decade of the 20th century. Although this was a...1980s
This category has the following 13 subcategories, out of 13 total.