BRIEF [O.A.] Gurley, Ralph Randolph Author: Gurley, Ralph Randolph Recipient: Haeckel, Ernst Dating: 12.07.1910
BRIEF [O.A.] Spencler, Otto Author: Spencler, Otto Recipient: Haeckel, Ernst Corporation: The Argus Pressclipping Bureau Dating: 13.08.1910
BRIEF OHNE UMSCHLAG Scheffauer, Herman Author: Scheffauer, Herman Recipient: Haeckel, Ernst Corporation: University Settlement New York Dating: 01.04.1910
BRIEF OHNE UMSCHLAG Scheffauer, Herman Author: Scheffauer, Herman Recipient: Haeckel, Ernst Corporation: University Settlement New York Dating: 01.08.1910
BRIEF OHNE UMSCHLAG Scheffauer, Herman Author: Scheffauer, Herman Recipient: Haeckel, Ernst Corporation: University Settlement Dating: 16.09.1910
BRIEF [O.A.] Boyer, Andr... J... Author: Boyer, Andr... J... Recipient: Haeckel, Ernst Dating: 13.03.1910
BRIEF OHNE UMSCHLAG Osborn, Henry Fairfield Author: Osborn, Henry Fairfield Recipient: Haeckel, Ernst Corporation: American Museum of Natural History Dating: 01.01.1910
BRIEF [O.A.] Holt, Hamilton Author: Holt, Hamilton Recipient: Haeckel, Ernst Corporation: The Independent Dating: 15.04.1910