This section contains the documents considered ephemeral owing to their temporality. It should be kept in mind          that this material provides a great quantity of information on specific aspects.          It comprises posters, leaflets, brochures, programmes, catalogues, picture plates and calendars. This material          has been gathered systematically since 1980, when the Legal Deposit was created, since this system requires the          delivery of the documents of this type to the BN.          Moreover, an ongoing search is carried out for earlier material, as in the case of books. For this reason, the          Library contains some items from the 1930s.          This section also brings together the electoral propaganda of the various political parties (electoral programmes,          posters of candidates, letters addressed to voters, etc.). This material is of great interest for the study of          the country's political evolution.          The programmes conserved here include those of the annual festivals of each municipality, and of the music, dance          and theatre seasons, etc.          The programmes conserved here include those of the annual festivals of each municipality, and of the music,          dance and theatre seasons, etc.          The catalogues are a sample of Andorra's cultural activity reflected in the various exhibitions held during the year.          Other materials such as picture plates and calendars also form part of this fonds.