Hedwigia

1870
1871
1875
1876
1880
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1890
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1898
1899
1900
1900
1901
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1903
1904
1905
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1907
1908
1910
1910
1912
1915
1916
1917
1919
1920
1920
1922