BRIEF [O.A.] Jensen, P... L... Author: Jensen, P... L... Recipient: Haeckel, Ernst Dating: 18.11.1877
BRIEF [O.A.] Jensen, P... L... Author: Jensen, P... L... Recipient: Haeckel, Ernst Dating: 02.12.1877
BRIEF [O.A.] Zülken, Chr... Author: Zülken, Chr... Recipient: Haeckel, Ernst Corporation: Universitetets Zoologiske Museum Dating: 06.12.1869
BRIEF [O.A.] Zülken, Chr... Author: Zülken, Chr... Recipient: Haeckel, Ernst Corporation: Universitetets Zoologiske Museum Dating: 16.07.1870
BRIEF [O.A.] Zülken, Chr... Author: Zülken, Chr... Recipient: Haeckel, Ernst Corporation: Universitetets Zoologiske Museum Dating: 23.05.1872
BRIEF [O.A.] Steenstrup, Japetus Author: Steenstrup, Japetus Recipient: Haeckel, Ernst Corporation: Zool. Mus. d. Kön. Univ. Dating: 09.11.1869
BRIEF [O.A.] Steenstrup, Japetus Author: Steenstrup, Japetus Recipient: Haeckel, Ernst Dating: 26.12.1869