Use these options to specify how the date range returns results. "Exact" means
that the start and end dates of descriptions returned must fall entirely within
the date range entered. "Overlapping" means that any description whose start or
end dates touch or overlap the target date range will be returned.
Descripción archivística 
Registro de autoridad 
Instituciones archivísticas 
Funciones 
Materias 
Lugares 
Objetos digitales 
