BRIEF [O.A.] Theszóll, Charles Author: Theszóll, Charles Recipient: Haeckel, Ernst Dating: 23-02-1900
BRIEF OHNE UMSCHLAG Teszóck, Charles A. Author: Teszóck, Charles A. Recipient: Haeckel, Ernst Dating: 23.02.1900
BRIEF [O.A.] Tarczay, Ludwig Author: Tarczay, Ludwig Recipient: Haeckel, Ernst Corporation: Vilagossag Dating: 12.06.1904
BRIEF OHNE UMSCHLAG Teszóck, Charles A. Author: Teszóck, Charles A. Recipient: Haeckel, Ernst Dating: 27.01.1900
BRIEF [O.A.] Holitscher, Ph... Author: Holitscher, Ph... Recipient: Haeckel, Ernst Dating: 19.11.1898