POSTKARTE Finsterbusch, Helene Author: Finsterbusch, Helene Recipient: Haeckel, Ernst Dating: 10.04.1905
POSTKARTE Seward, Albert Charles Author: Seward, Albert Charles Recipient: Haeckel, Ernst Dating: 07.12.1908
POSTKARTE Seward, Albert Charles Author: Seward, Albert Charles Recipient: Haeckel, Ernst Dating: 16.11.1908
POSTKARTE Seward, Albert Charles Author: Seward, Albert Charles Recipient: Haeckel, Ernst Dating: 29.05.1908
POSTKARTE Seward, Albert Charles Author: Seward, Albert Charles Recipient: Haeckel, Ernst Dating: 17.04.1908