BRIEF [O.A.] Danielssen, D... C... Author: Danielssen, D... C... Recipient: Haeckel, Ernst Corporation: Bergens Museums Dating: 10.01.1879
BRIEF [O.A.] Danielssen, D... C... Author: Danielssen, D... C... Recipient: Haeckel, Ernst Corporation: Bergens Museums Dating: 12.11.1882
BRIEF [O.A.] Danielssen, D... C... Author: Danielssen, D... C... Recipient: Haeckel, Ernst Corporation: Bergens Museums Dating: 15.03.1886
BRIEF [O.A.] Danielssen, D... C... Author: Danielssen, D... C... Recipient: Haeckel, Ernst Corporation: Bergens Museums Dating: 24.01.1889
BRIEF [O.A.] Danielssen, D... C... Author: Danielssen, D... C... Recipient: Haeckel, Ernst Dating: 12.12.1889
BRIEF [O.A.] Danielssen, D... C... Author: Danielssen, D... C... Recipient: Haeckel, Ernst Corporation: Bergens Museums Dating: 13.10.1890
BRIEF [O.A.] Biddlecombe, A... Author: Biddlecombe, A... Recipient: Haeckel, Ernst Dating: 30.07.1908