BRIEF [O.A.] Gurley, Ralph Randolph Author: Gurley, Ralph Randolph Recipient: Haeckel, Ernst Dating: 08.02.1909
BRIEF [O.A.] Kirck, Hyland C... Author: Kirck, Hyland C... Recipient: Haeckel, Ernst Corporation: The Plaza Dating: 15.12.1909
BRIEF [O.A.] Bain, George Grantham Author: Bain, George Grantham Recipient: Haeckel, Ernst Corporation: Newspaper Feature and Portrait Service Dating: 05.01.1909
BRIEF OHNE UMSCHLAG Scheffauer, Herman Author: Scheffauer, Herman Recipient: Haeckel, Ernst Corporation: University Settlement Dating: 13.08.1909
BRIEF OHNE UMSCHLAG Scheffauer, Herman Author: Scheffauer, Herman Recipient: Haeckel, Ernst Corporation: University Settlement Dating: 12.09.1909
BRIEF OHNE UMSCHLAG Scheffauer, Herman Author: Scheffauer, Herman Recipient: Haeckel, Ernst Corporation: University Settlement New York Dating: 28.10.1909
BRIEF OHNE UMSCHLAG Adler, M... M... Author: Adler, M... M... Recipient: Haeckel, Ernst Dating: 12.04.1909