BRIEF OHNE UMSCHLAG Walther, Hermann Author: Walther, Hermann Recipient: Haeckel, Ernst Corporation: Verlagsbuchhandlung Dating: 12.06.1894
BRIEF OHNE UMSCHLAG Walther, Hermann Author: Walther, Hermann Recipient: Haeckel, Ernst Dating: 25.06.1894
BRIEF OHNE UMSCHLAG Zeller, Eduard Author: Zeller, Eduard Recipient: Haeckel, Ernst Dating: 24.01.1894