Era
- 20th century 8 results
- 1922- 4 results
- 1789-1900 3 results
- 19th century 3 results
- 1923-2008 2 results
- Mesozoic 2 results
- Socialist Uprising, February 1934 2 results
- 1849-1940 1 results
- 1861-1925 1 results
- 1868-1912 1 results
- 18th century 1 results
- 1912-1945 1 results
- 1917-1965 1 results
- 1943- 1 results
- 1944- 1 results
- 1949- 1 results
- 1952- 1 results
- 1979-1997 1 results
- Cenozoic 1 results
- Devonian 1 results