Era
Revolution, 1917-1921
6
1900-1999
4
1917-1921
4
20th century
4
1917 - 1921
2
1918-
2
1918-1938
2
1939-1945
2
1944-1989 (Polska Ludowa)
2
1945-
2
1945-1989
2
1945-1992
2
German occupation, 1940-1945
2
Since 1918
2
1600-1699
1
1760-1789
1
17th century
1
1861-1865
1
1976-2009
1
Civil War, 1861-1865
1
Colonial period, ca. 1600-1775
1
Geschichte
1