Contains 84 letters received in Valparaiso, Chile and Lima, Peru. These letters reveal an affectionate and supportive relationship between the two men, and a mutual appreciation for the beauty of Argentina. Oro offers his sympathy to Rugendas after Rugenadas was rejected by Clara Álvarez, encouraging him to continue with his artistic work as a means of convalescing. He informs Rugendas as to the whereabouts and wellbeing of mutual friends, including Juan Godoy, Juan de Espinosa, and Carmen Guticke. The friendship of Oro and Rugendas seems strengthened by their experiences as exiles and their disdain for the policies of Governor Juan Manuel de Rosas of Argentina.

Contains 2 letters and 4 poems. Godoy uses Rugendas as a sounding board for ideas about his creative work. The poems and letters express his deep passion for the lyrical poetry of "los payadores," the minstrels of the pampas.

Contains 79 letters. Espinosa's prose is gentle and poetic with affectionate overtones. He often questions Rugendas for any news of their friends, especially Juan Godoy and Domingo de Oro. His status in the Uruguayan military allows him to travel extensively throughout the backcountry of Argentina. His letters include detailed descriptions of the terrain of the pampas, including small sketches of sites of interest. Espinosa also compiles lists of common native terminology and expressions and their usage. He encourages Rugendas to document the beauty of Argentina in his artwork. Espinosa's letters served as a catalyst and as a guide for Rugendas' successful journeys in Argentina.

Contains 27 letters. Many of the letters center around the activities of Carmen Guticke. The two men seem to share a common opinion of Rosas' reign as governor.