WIDMUNG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Sarasin, Paul; Sarasin, Fritz Dating: 1898.??.?? [oder danach]
WIDMUNG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Sarasin, Paul; Sarasin, Fritz Dating: 1909.??.?? [oder danach]
WIDMUNG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Sarasin, Paul; Sarasin, Fritz Dating: 1906.??.?? [oder danach]
WIDMUNG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Sarasin, Paul; Sarasin, Fritz Dating: 1893.??.?? [oder danach]