BRIEF [O.A.] Corswant, Carl von Author: Corswant, Carl von Recipient: Haeckel, Ernst Dating: 21.06.1894
BRIEF [O.A.] Corswant, Carl von Author: Corswant, Carl von Recipient: Haeckel, Ernst Dating: 27.07.1894
BRIEF [O.A.] Corswant, Carl von Author: Corswant, Carl von Recipient: Haeckel, Ernst Dating: 26.10.1894
BRIEF [O.A.] Kleinowsky, W... S... Author: Kleinowsky, W... S... Recipient: Haeckel, Ernst Corporation: W. S. Kleinowsky, Buchdruckerei, Verlag und Expedition des "Grimmer Kreis-Wochenblatt" Dating: 27.05.1894
BRIEF [O.A.] Kleinowsky, W... S... Author: Kleinowsky, W... S... Recipient: Haeckel, Ernst Corporation: W. S. Kleinowsky, Buchdruckerei, Verlag und Expedition des "Grimmer Kreis-Wochenblatt" Dating: 05.06.1894