http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Estadisticas historicas = Statistical yearbook. Historical statistics
Statistical yearbook. Historical statistics
Some volumes also available in microfiche.
Vols. for 1959- prepared by the Bureau's Division of Statistics, Economic Indices Section.
Supplement to Anuario estadistico: Puerto Rico.