BRIEF OHNE UMSCHLAG Paetel, Hermann Author: Paetel, Hermann Recipient: Haeckel, Ernst Corporation: Verein für Deutsche Literatur Dating: 27.12.1886
BRIEF [O.A.] Patschkowski, M... Author: Patschkowski, M... Recipient: Haeckel, Ernst Dating: 07.07.1886
POSTKARTE Weinland, David Friedrich Author: Weinland, David Friedrich Recipient: Haeckel, Ernst Dating: 15.05.1886
BRIEF [O.A.] Walther, Johannes Author: Walther, Johannes Recipient: Haeckel, Ernst Dating: 22.01.1886
BRIEF [O.A.] Walther, Johannes Author: Walther, Johannes Recipient: Haeckel, Ernst Dating: 24.01.1886
BRIEF [O.A.] Walther, Johannes Author: Walther, Johannes Recipient: Haeckel, Ernst Dating: 04.02.1886
