BRIEF [O.A.] Rottenburg, Paul von Author: Rottenburg, Paul von Recipient: Haeckel, Ernst Dating: 28.07.1881
BRIEF [O.A.] Gemmill, James F... Author: Gemmill, James F... Recipient: Haeckel, Ernst Corporation: The University Dating: 22.01.1900
BRIEF [O.A.] Mc Kendrick, John G... Author: Mc Kendrick, John G... Recipient: Haeckel, Ernst Dating: 01.09.1894
BRIEF [O.A.] McKendrick, John G... Author: McKendrick, John G... Recipient: Haeckel, Ernst Corporation: Philosophical Society of Glasgow Dating: 18.12.1880
BRIEF [O.A.] Rottenburg, Paul von Author: Rottenburg, Paul von Recipient: Haeckel, Ernst Dating: 03.05.1902
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Charlotte Dating: 19.09.1876
BRIEF OHNE UMSCHLAG Rottenburg, Paul von Author: Rottenburg, Paul von Recipient: Haeckel, Ernst Dating: 20.12.1892