BRIEF [O.A.] Williams, Clarence Author: Williams, Clarence Recipient: Haeckel, Ernst Dating: 30.11.1909
BRIEF [O.A.] Williams, Clarence Author: Williams, Clarence Recipient: Haeckel, Ernst Dating: 25.12.1909
BRIEF [O.A.] Wakeman, Thaddeus Burr Author: Wakeman, Thaddeus Burr Recipient: Haeckel, Ernst Corporation: The Torch of Reason Dating: 06.08.1903
BRIEF [O.A.] Hempel, Max Author: Hempel, Max Recipient: Haeckel, Ernst Corporation: Bund der Freien Gemeinden und Freidenker-Vereine von Nord-Amerika Dating: 18.06.1904
BRIEF [O.A.] Eldredge, Charles F... Author: Eldredge, Charles F... Recipient: Haeckel, Ernst Corporation: Office of The Philosopher Dating: 14.04.1902
BRIEF OHNE UMSCHLAG Amerland, William H. Author: Amerland, William H. Recipient: Haeckel, Ernst Corporation: A. Leschen & Sons Rope Co. Dating: 26.05.1910
BRIEF OHNE UMSCHLAG Amerland, William H. Author: Amerland, William H. Recipient: Haeckel, Ernst Dating: 11.02.1914