Brief an College [Rudolf Lipschitz]
Halle (Saale), 04.05.1877 [d. 4.ten Mai 1877]Brief an College [Rudolf Lipschitz]
Halle (Saale), 20.11.1881 [20 Nov 1881]Brief an College [Rudolf Lipschitz]
Halle (Saale), 17.12.1881 [17 Dec 1881]Brief an College [Rudolf Lipschitz]
Berlin, 10.10.1885 [10 Oct. 1885]Brief an College [Rudolf Lipschitz]
Halle (Saale), 18.10.1885 [18 Oct. [18]85]Brief an Kollege [Rudolf Lipschitz]
Halle (Saale), 19.11.1883 [19t Nov. 1883]