BRIEF [O.A.] Krauseneck, Valentine Author: Krauseneck, Valentine Recipient: Haeckel, Ernst Dating: 31.05.1914
BRIEF [O.A.] Marchesetti, Carlo de Author: Marchesetti, Carlo de Recipient: Haeckel, Ernst Corporation: Museo Civico di Storia Naturale Dating: 15.02.1914
BRIEF [O.A.] Zabretti, Ferdinando Author: Zabretti, Ferdinando Recipient: Haeckel, Ernst Dating: 23.02.1914
BRIEF [O.A.] Groß, Julius Author: Groß, Julius Recipient: Haeckel, Ernst Corporation: Stazione Zoologica Napoli Dating: 28.08.1914
BRIEF [O.A.] Seilern, Therese [Gräfin] Author: Seilern, Therese [Gräfin] Recipient: Haeckel, Ernst Dating: 16.02.1914
BRIEF [O.A.] Jovanhini, Alfonso Author: Jovanhini, Alfonso Recipient: Haeckel, Ernst Dating: 21.02.1914
BRIEF [O.A.] Jovanhini, Alfonso Author: Jovanhini, Alfonso Recipient: Haeckel, Ernst Dating: 04.07.1914
BRIEF [O.A.] Grassi, Giovanni Battista Author: Grassi, Giovanni Battista Recipient: Haeckel, Ernst Corporation: Senato del Regno Dating: 27.08.1914