http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
andamios colgantes: clasificación, dimensiones y usos Hygiene and safety : hanging scaffolds : classification, dimensions and uses
hanging scaffolds. Classification, dimensions and uses
Instituto Colombiano de Normas Técnicas y Certificación (Icontec)