ANSICHTSKARTE Crompton, Ella von Author: Crompton, Ella von Recipient: Haeckel, Ernst Dating: 25.09.1917
BRIEF [O.A.] Gaedertz, Karl Theodor Author: Gaedertz, Karl Theodor Recipient: Haeckel, Ernst Dating: 03.09.1901
BRIEF [O.A.] Schlegel, Charles A... Author: Schlegel, Charles A... Recipient: Haeckel, Ernst Dating: 10.10.1888
BRIEF OHNE UMSCHLAG [Tesdorpf, Louise, geb. Oppenheimer] Author: [Tesdorpf, Louise, geb. Oppenheimer] Recipient: Haeckel, Ernst Dating: 12.02.1914
BRIEF [O.A.] Krannhals, Woldemar Alexander Author: Krannhals, Woldemar Alexander Recipient: Haeckel, Ernst Dating: 15.02.1915
BRIEF [O.A.] Krannhals, Woldemar Alexander Author: Krannhals, Woldemar Alexander Recipient: Haeckel, Ernst Dating: 05.03.1917
BRIEF [O.A.] Krannhals, Woldemar Alexander Author: Krannhals, Woldemar Alexander Recipient: Haeckel, Ernst Dating: 14.02.1918