BRIEF [O.A.] Wagenschieber, W... Author: Wagenschieber, W... Recipient: Haeckel, Ernst Dating: 12.09.1863
BRIEF [O.A.] Anna Haeckel Author: Anna Haeckel Recipient: Charlotte Haeckel, Carl Gottlob Haeckel Dating: 27.08.1863
BRIEF [O.A.] Haeckel, Anna Author: Haeckel, Anna Recipient: Charlotte Haeckel, Carl Gottlob Haeckel Dating: 29.10.1863