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Allmers, Hermann
(1)
Besser, Leopold
(1)
Bölsche, Wilhelm
(1)
Breitenbach, Wilhelm
(1)
Freiesleben, Hedwig
(1)
Giltsch, Adolf
(1)
Haeckel, Agnes
(25)
Haeckel, Carl & Charlotte [Eltern]
(3)
Haeckel, Ernst
(1437)
Haeckel, Ernst & Agnes [Eltern]
(1)
Haeckel, Ernst; Haeckel, Agnes [Eltern]
(8)
Haeckel, Walter
(3)
Haeckel, Walther
(1)
Henning, Max
(1)
Huschke, Emil
(1)
Mentz, Frida
(3)
Meyer, Hans
(2)
N.N.
(5)
Palmén, Johan Axel
(1)
Paul, Charles Kegan (et al.]
(1)
Pohle, Franz
(4)
Reinicke, E.
(1)
Riess, Carl
(1)
Schmidt, Heinrich
(3)
Schwarz, Arthur
(1)
Sethe, Bertha
(2)
Uslar-Gleichen, Frida von
(1)
Walther, Johannes
(1)
Watts, Charles
(1)
Ziegler, Heinrich Ernst
(1)
Ziegler, Heinrich Ernst [vermutl.]
(1)
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BRIEF [O.A.]
Hantzsch, Rudolf
Author:
Hantzsch, Rudolf
Recipient:
Haeckel, Ernst
Dating:
30.11.1916
BRIEF [O.A.]
Hantzsch, Arthur
Author:
Hantzsch, Arthur
Recipient:
Haeckel, Ernst
Dating:
15.02.1917
BRIEF [O.A.]
Hantzsch, Arthur
Author:
Hantzsch, Arthur
Recipient:
Haeckel, Ernst
Dating:
06.03.1917
BRIEF [O.A.]
Hantzsch, Arthur
Author:
Hantzsch, Arthur
Recipient:
Haeckel, Ernst
Dating:
08.11.1917
BRIEF [O.A.]
Hantzsch, Arthur
Author:
Hantzsch, Arthur
Recipient:
Haeckel, Ernst
Dating:
15.02.1918
BRIEF [O.A.]
Meyer, Hans
Author:
Meyer, Hans
Recipient:
Haeckel, Ernst
Dating:
15.02.1895
BRIEF [O.A.]
Meyer, Hans
Author:
Meyer, Hans
Recipient:
Haeckel, Ernst
Dating:
08.12.1895
BRIEF [O.A.]
Meyer, Hans
Author:
Meyer, Hans
Recipient:
Haeckel, Ernst
Dating:
19.06.1895
BRIEF [O.A.]
Meyer, Hans
Author:
Meyer, Hans
Recipient:
Haeckel, Ernst
Dating:
22.09.1894
POSTKARTE
Meyer, Hans
Author:
Meyer, Hans
Recipient:
Haeckel, Ernst
Dating:
30.09.1894
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