BRIEF OHNE UMSCHLAG Schmidt, Oscar Author: Schmidt, Oscar Recipient: Haeckel, Ernst Dating: 23.11.1866
BRIEF [O.A.] Hoernes, Rudolf Author: Hoernes, Rudolf Recipient: Haeckel, Ernst Corporation: Geologisches Institut der k.k. Universität Dating: 17.12.1910
BRIEF [O.A.] Hontschik, Henriette Author: Hontschik, Henriette Recipient: Haeckel, Ernst Dating: 11.02.1911
BRIEF OHNE UMSCHLAG Hesse, Alexander Author: Hesse, Alexander Recipient: Haeckel, Ernst Dating: 05.07.1879
BRIEF OHNE UMSCHLAG Schuchardt, Hugo Author: Schuchardt, Hugo Recipient: Haeckel, Ernst Dating: 25.11.1881
BRIEF OHNE UMSCHLAG Schuchardt, Hugo Author: Schuchardt, Hugo Recipient: Haeckel, Ernst Dating: 19.04.1882
BRIEF OHNE UMSCHLAG Schulze, Franz Eilhard Author: Schulze, Franz Eilhard Recipient: Haeckel, Ernst Dating: 22.12.1879
BRIEF OHNE UMSCHLAG Schulze, Franz Eilhard Author: Schulze, Franz Eilhard Recipient: Haeckel, Ernst Dating: 12.01.1881