BRIEF [O.A.] Chasterwood, Mary Author: Chasterwood, Mary Recipient: Haeckel, Ernst Dating: 11.01.1900
BRIEF [O.A.] Chidley, W... S... Author: Chidley, W... S... Recipient: Haeckel, Ernst Dating: 30.04.1900
BRIEF [O.A.] Cless, Alfred Martin Author: Cless, Alfred Martin Recipient: Haeckel, Ernst Dating: 24.03.1900
BRIEF OHNE UMSCHLAG Baker, Ray Stannard Author: Baker, Ray Stannard Recipient: Haeckel, Ernst Dating: 02.06.1900
BRIEF OHNE UMSCHLAG Baker, Ray Stannard Author: Baker, Ray Stannard Recipient: Haeckel, Ernst Corporation: The S. S. McClure Co. Dating: 22.06.1900
BRIEF [O.A.] Camerano, Lorenzo Author: Camerano, Lorenzo Recipient: Haeckel, Ernst Dating: 28.05.1900
BRIEF [O.A.] Fenizia, Carlo Author: Fenizia, Carlo Recipient: Haeckel, Ernst Corporation: Società per la Diffusione delle Scienze fisiche e Naturali e delle loro Applicazioni, Sezione Italiana Dating: 12.03.1900
