"This multilingual thesaurus in English, French, and Spanish provides a "documentation language" developed at the request of the Division of Communication Research and Planning of UNESCO. Precise terms designed to be used in post-storage retrieval of computerized documents are consistent with international documentation systems in related fields. The first part is a subject arrangement; the second part, an alphabetical listing." (Eleanor Blum, Frances G. Wilhoit: Mass media bibliography. 3rd ed. Urbana: University of Illinois Press, 1990 Nr. 441 about the 1st ed. 1975)