It is wonderful for libraries to have UNESCO digital publications free-of-charge. It is particularly useful for those who are interested in issues in an international scope, whether in teaching or researching.

UNESCO Publications to Be Free Under Open License

http://www.unesco.org/new/en/media-services/single-view/news/unesco_to_make_its_publications_available_free_of_charge_as_part_of_a_new_open_access_policy/