Haessel, Hermann Adolf: 163 Briefe, 20 Postkarten, 38 Karten, 2 Umschläge, 14 Beilagen an Conrad Ferdinand Meyer-Ziegler, L[uise] Meyer-Ziegler / H.A. Haessel an B. Meyer, s.d. (Ms CFM 335.XXVIII.1). [S.l.], 1880
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