Brief an Doctor Wölker [Friedrich Gottlieb Welcker] in Darmstadt
Rom, 17.07.1808 [17 Juli 1808]Brief an "Mio Bene" [Friedrich Gottlieb Welcker]
Rom, 01.1808 [im Januar 1808]Brief an Professor F. G. Welker in Bonn
Rom, 10.05.1847 [10. May 1847]Brief an Professor Welker in Bonn
Rom, 27.12.1843 [27 December 1843]Brief an Professor Wölker [Friedrich Gottlieb Welcker] in Gießen
Rom, 25.07.1810 [25 Juli 1810]Brief an Professore Welker a Bonn
Rom, 24.05.1826 [24 May 1826]