BRIEF [O.A.] Weinländer, Georg Author: Weinländer, Georg Recipient: Haeckel, Ernst Dating: 22.10.1910
BRIEF [O.A.] Strunz, Franz [PD] Author: Strunz, Franz [PD] Recipient: Haeckel, Ernst Dating: 01.10.1910
BRIEF OHNE UMSCHLAG Suttner-Kinsky, Baronin Bertha von Author: Suttner-Kinsky, Baronin Bertha von Recipient: Haeckel, Ernst Dating: 04.08.1910
BRIEF [O.A.] Grobben, Karl Author: Grobben, Karl Recipient: Haeckel, Ernst Corporation: 1. Zoologisches Institut, K. K. Universität Wien Dating: 04.06.1910
BRIEF [O.A.] Gabriel, Gábor Raimund Author: Gabriel, Gábor Raimund Recipient: Haeckel, Ernst Dating: 22.11.1910
BRIEF [O.A.] Gabriel, Gábor Raimund Author: Gabriel, Gábor Raimund Recipient: Haeckel, Ernst Dating: 30.11.1910