BRIEF OHNE UMSCHLAG Bernard, Henry Author: Bernard, Henry Recipient: Haeckel, Ernst Corporation: National History Museum Dating: 08.11.1901
BRIEF OHNE UMSCHLAG Finlayson, Arthur Author: Finlayson, Arthur Recipient: Haeckel, Ernst Dating: 26.08.1901
BRIEF OHNE UMSCHLAG Watts, Charles A. Author: Watts, Charles A. Recipient: Haeckel, Ernst Corporation: The Rationalist Press Association Dating: 10.09.1901
BRIEF OHNE UMSCHLAG Schmitz, L. Dora Author: Schmitz, L. Dora Recipient: Haeckel, Ernst Dating: 12.02.1901
BRIEF OHNE UMSCHLAG Spencer, Herbert Author: Spencer, Herbert Recipient: Haeckel, Ernst Dating: 26.10.1901
BRIEF OHNE UMSCHLAG Steel, Richard Author: Steel, Richard Recipient: Haeckel, Ernst Dating: 13.02.1901
BRIEF OHNE UMSCHLAG Holthusen, Ludwig Author: Holthusen, Ludwig Recipient: Haeckel, Ernst Corporation: Holthusen & Co. Dating: 10.05.1901
BRIEF OHNE UMSCHLAG Watts, Charles A. Author: Watts, Charles A. Recipient: Haeckel, Ernst Dating: 11.07.1901
BRIEF OHNE UMSCHLAG Geddes, Patrick Author: Geddes, Patrick Recipient: Haeckel, Ernst Corporation: International Association for the Advancement of Science, Arts and Education Dating: 27.10.1901