BRIEF [O.A.] Palmén, Johan Axel Author: Palmén, Johan Axel Recipient: Haeckel, Ernst Dating: 11.02.1892
BRIEF [O.A.] Palmén, Johan Axel Author: Palmén, Johan Axel Recipient: Haeckel, Ernst Dating: 05.01.1894
BRIEF [O.A.] Palmén, Johan Axel Author: Palmén, Johan Axel Recipient: Haeckel, Ernst Dating: 10.06.1899
BRIEF [O.A.] Palmén, Johan Axel Author: Palmén, Johan Axel Recipient: Haeckel, Ernst Dating: 05.04.1904