POSTKARTE Cerruti, Valentinus Author: Cerruti, Valentinus Recipient: Haeckel, Ernst Dating: 16.03.1904
POSTKARTE Cerruti, Valentinus Author: Cerruti, Valentinus Recipient: Haeckel, Ernst Corporation: Regia Lynceorum Academia Dating: 16.03.1904
POSTKARTE Cerruti, Valentinus Author: Cerruti, Valentinus Recipient: Haeckel, Ernst Corporation: Regia Lynceorum Academia Dating: 06.05.1904