Havana: Guairas Book Inst. 1967. Hardcover. 48p., + photo section at rear, introduction, text in English, illustrated with b&w photos, blind-stamped 7.5x4.5 inch red leatherette, has a small loss to top rim of spine panel (shows a little underlying card), a bookplate/label on front free endsheet, good copy.
Che's letter to Carlos Quijano originally (1965) titled "El Socialismo y el Hombre en Cuba"