BRIEF OHNE UMSCHLAG Freudenberg, Philipp Author: Freudenberg, Philipp Recipient: Haeckel, Ernst Dating: 18.07.1881
BRIEF OHNE UMSCHLAG James, Walter Knight Author: James, Walter Knight Recipient: Haeckel, Ernst Corporation: Government Normal Institution Dating: 20.03.1883
BRIEF OHNE UMSCHLAG Ankenbrand, Ludwig Author: Ankenbrand, Ludwig Recipient: Haeckel, Ernst Dating: 15.03.1914
BRIEF OHNE UMSCHLAG James, Walter Knight Author: James, Walter Knight Recipient: Haeckel, Ernst Corporation: Government Normal Institution Dating: 08.01.1883
BRIEF OHNE UMSCHLAG Ravenscroft, William Henry Author: Ravenscroft, William Henry Recipient: Haeckel, Ernst Dating: 07.12.1881
BRIEF OHNE UMSCHLAG Rottenburg, Paul von Author: Rottenburg, Paul von Recipient: Haeckel, Ernst Dating: 19.03.1914
BRIEF OHNE UMSCHLAG Rottenburg, Paul von Author: Rottenburg, Paul von Recipient: Haeckel, Ernst Dating: 15.04.1914