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Many types of source works require a "Descriptor" to further identify the work in order to facilitate the relocation of the work by readers.
In some instances, these types of works do not have a unique title, and must therefore be described as a "map", "letter", "review", "interview," "chart", "editorial" and so on.
In other instances, the work does have a unique title, but needs to be described for the reader as a work other than the typical article or book - as a "technical report", "monograph", "symposium", "leaflet", "reprint", "working paper", etc.