Airmail cover with printed 'Padres de Maryknoll, Parroquia, Cachuela Esperanza, Beni' return address franked with 1942 10b purple and 1943 2.10b pale blue & 3b brown & light blue (SG 395, 401 & 418) tied by two fine strikes of boxed SUBADMINISTRACION DE CORREOS CACHUELA ESPERANZA DTTO 11 - RIBERALTA cancel in green dated 31 MAY 1944. Addressed to USA and censored with censor tape at left. A scarce origination in the Bolivian Amazon.