1
Published 1853
Book
2
Published 1884
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3
Published 1888
Zettel
Volltext
Book
4
Published 1897
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5
Published 1903
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6
Published 1906
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8
Published 1909
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9
Published 1916
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10
Published 1919
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11
Published 1923
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12
Published 1925
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13
Published 1926
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14
Published 1926
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15
Published 1927
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16
Published 1928
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17
Published 1932
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18
Published 1935
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19
Published 1938
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20
Published 1942
Book