Brief an Althoff
Bonn, 29. Juni [18]89Brief an G[eheim]R[at] Althoff
Bonn, 20. Jan. [18]89Brief an Geh[eim]R[at Althoff]
Bonn, 3 Jan 1889Brief an Geh[eim]R[at Althoff]
Bonn, 21 Sept. [1889]Brief an Geh[eim]R[at Althoff]
Bonn, 22 Sept. 1889Brief an Geheimrat [Althoff]
Bonn, 20. Juni [18]89Brief an Geheimrat [Althoff]
Bonn, 1. Juni 1889