Brief [an Friedrich Christian Diez]
Kostheim, 18.07.1867 [18 Juli 1867]Brief [an Friedrich Christian Diez]
Mailand, 16.09.1869 [16 settembre 1869]Brief [an Friedrich Christian Diez]
Mailand, 04.12.1871 [4 dicembre 1871]Brief [an Friedrich Christian Diez]
Mailand, 28.12.1871 [28 dicembre 1871]Brief [an Friedrich Christian Diez]
Mailand, 04.01.1872 [4 gennajo 1872]Brief [an Friedrich Christian Diez]
Mailand, 03.02.1872 [3 febbrajo 1872]Brief [an Friedrich Christian Diez]
Wien, 20.10.1868 [20 Oct. 1868]Brief [an Friedrich Christian Diez]
Wien, 23.11.1868 [23 Nov. 1868]Brief [an Friedrich Christian Diez]
Wien, 29.01.1870 [29 Janv. 1870]Brief an maestro [Friedrich Christian Diez]
Mailand, 09.06.1870 [9 giugno 1870]Brief an Professor [Friedrich Christian Diez]
Wien, 26.03.1869 [26 März 1869]Brief an Professor [Friedrich Christian Diez]
Wien, 28.12.1865 [28 December 1865]Brief an Professor [Friedrich Christian Diez]
Wien, 14.10.1867 [14 October 1867]Brief an Professor [Friedrich Christian Diez]
Wien, 19.01.1871 [19 Jänner 1871]Brief an Professor [Friedrich Christian Diez]
Wien, 25.03.1871 [25 März 1871]Brief an Professor [Friedrich Christian Diez]
Wien, 16.05.1873 [16. Mai 1873]Brief an Professor [Friedrich Christian Diez]
Sankt Petersburg, 25.12.1870 [am Weihnachtstag 1870]Brief an Professor [Friedrich Christian Diez]
Sankt Petersburg, 30.01.1873 [18/30 Jan. 1873]Brief an Professor [Friedrich Christian Diez]
Sankt Petersburg, 04.02.1872 [23. Jan (4. Febr. 1872)]Brief an Professor F. Diez, Bonn
Kostheim, 14.10.1870 [14/10. [18]70]