BRIEF [O.A.] Johnson, F... W... Author: Johnson, F... W... Recipient: Haeckel, Ernst Dating: 03.12.????
POSTKARTE Young, James Carleton Author: Young, James Carleton Recipient: Haeckel, Ernst Dating: 30.10.1905
BRIEF [O.A.] Holzinger, John M... Author: Holzinger, John M... Recipient: Haeckel, Ernst Corporation: Winona Charter and Commission Board Dating: 31.03.1914