TELEGRAMM Grassi, Giovanni Battista Author: Grassi, Giovanni Battista Recipient: Haeckel, Ernst Dating: 07.03.1907
BRIEF [O.A.] Grassi, Giovanni Battista Author: Grassi, Giovanni Battista Recipient: Haeckel, Ernst Dating: 22.05.1897
BRIEF [O.A.] Grassi, Giovanni Battista Author: Grassi, Giovanni Battista Recipient: Haeckel, Ernst Dating: 07.09.1899
BRIEF [O.A.] Grassi, Giovanni Battista Author: Grassi, Giovanni Battista Recipient: Haeckel, Ernst Corporation: Lyncei Dating: ??.??.1907
BRIEF [O.A.] Grassi, Giovanni Battista Author: Grassi, Giovanni Battista Recipient: Haeckel, Ernst Corporation: Istituto di Anatomia Comparata della r. Università di Roma Dating: 03.04.1909
TELEGRAMM Grassi, Giovanni Battista Author: Grassi, Giovanni Battista Recipient: Haeckel, Ernst Dating: 18.05.1911
TELEGRAMM Grassi, Giovanni Battista Author: Grassi, Giovanni Battista Recipient: Haeckel, Ernst Dating: 21.11.1911
POSTKARTE Grassi, Giovanni Battista Author: Grassi, Giovanni Battista Recipient: Haeckel, Ernst Corporation: Senato del Regno
BRIEF [O.A.] Grassi, Giovanni Battista Author: Grassi, Giovanni Battista Recipient: Haeckel, Ernst Corporation: Senato del Regno Dating: 16.01.1911