BRIEF [O.A.] Zürn, Friedrich Anton Author: Zürn, Friedrich Anton Recipient: Haeckel, Ernst Dating: 10.??.1872
BRIEF [O.A.] Zülken, Chr... Author: Zülken, Chr... Recipient: Haeckel, Ernst Corporation: Universitetets Zoologiske Museum Dating: 23.05.1872
BRIEF OHNE UMSCHLAG Spencer, Herbert Author: Spencer, Herbert Recipient: Haeckel, Ernst Dating: 02.01.1872
BRIEF OHNE UMSCHLAG Willemoes-Suhm, R. von Author: Willemoes-Suhm, R. von Recipient: Haeckel, Ernst Dating: 02.04.1872
BRIEF [O.A.] Seidlitz, Georg [von] Author: Seidlitz, Georg [von] Recipient: Haeckel, Ernst Dating: 17.03.1872
BRIEF OHNE UMSCHLAG Wagner, Moritz Author: Wagner, Moritz Recipient: Haeckel, Ernst Dating: 23.07.1872
BRIEF OHNE UMSCHLAG Wagner, Moritz Author: Wagner, Moritz Recipient: Haeckel, Ernst Dating: 27.07.1872