Joaquín de Yturralde y López Silvero was the Consul of Spain in Havana in the 1920s during the presidencies of Dr. Alfredo Zayas and General Gerardo Machado y Morales. His papers contain correspondence from 1925 to 1926 and other materials such as invitations, programs, and financial records.

The Luis Manuel del Pilar collection on Carlos Alfonzo contains illuminated manuscript correspondence from Carlos Alfonzo to del Pilar in the 1980s.