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.
![Assembleia Campanha Salarial Sindical no Auditório Araujo Viana (Porto Alegre-RS 19 mar. [1979?]). / Crédito: Protásio Nené](/uploads/r/centro-sergio-buarque-de-holanda-csbh-fpa/f/c/5/fc50fdc6b30ac9ae96489495c9297bcecbee7b05d44afa15f4f54e8a41747a35/_usr_share_nginx_atom_csbh-dados_PTDN_F_0684_0002_142.jpg)