BRIEF [O.A.] Gildemeister, E... Author: Gildemeister, E... Recipient: Haeckel, Ernst Dating: 18.01.1871
BRIEF [O.A.] Gildemeister, E... Author: Gildemeister, E... Recipient: Haeckel, Ernst Dating: 23.02.1871
BRIEF OHNE UMSCHLAG Bacmeister, Adolf Author: Bacmeister, Adolf Recipient: Haeckel, Ernst Dating: 22.03.1871
