After his retirement in 1950, the position of Official Historian remained vacant for 43 years, until the Puerto Rico House of Representatives approved in 1993 Senate Concurrent Resolution 14, authored by Sen. Kenneth McClintock, designated Dr. Pilar Barbosa.
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His most prominent publication is "Ciudad Murada", the history of the city of San Juan, Puerto Rico, the United States' oldest city.
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De Hostos had served in the Army and as military aide to Gov. Arthur Yeager before his appointment by Gov. Blanton Winship.
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Adolfo de Hostos (born 1887) served in the mid twentieth century, from January 1936 to 1950, as the fifth Official Historian of Puerto Rico, a position created in March, 1903, by the Puerto Rico Legislature.
Adolfo Müller-Ury | Adolfo Pérez Esquivel | Adolfo Alsina | Adolfo Bioy Casares | Hostos Community College | Enrique Adolfo Jiménez | Adolfo Zaldívar | Adolfo Rodríguez Saá | Adolfo López Mateos | Adolfo Ibanez University | Adolfo Aguilar Zínser | Gustavo Adolfo Bécquer | Francisco Adolfo de Varnhagen, Viscount of Porto Seguro | Édgar Adolfo Hernández | Adolfo Tito Yllana | Adolfo Targioni Tozzetti | Adolfo Obiang Biko | Adolfo Nicolás | Adolfo Mexiac | Adolfo Luxúria Canibal | Adolfo Hohenstein | Adolfo "El Bofo" Bautista | Adolfo Doring | Adolfo Costa du Rels | Adolfo Constanzo | Adolfo Colombo | Adolfo Celi | Adolfo Castelo | Adolfo Carrión, Jr. | Adolfo Camarillo |