With the exception of the work that Varnhagen published with Jos?onrado Carlos de Chelmicki, where the sections are distinct (Varnhagen was concerned with the historical part and Chelmicki with the geographical part), I have not yet found any other work co-authored by Varnhagen. See VARNHAGEN, F. A. de./ CHELMICKI, J. C. C. de. Corografia Cabo-Verdiana, ou descrip? geografico-hist?a da provincia das Ilhas de Cabo-Verde e Guin?t;/i>. Lisbon, Typ. by L. C. da Cunha, 1841. 2 vol.