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A pamphlet is an unbound book (that is, without a hard cover or binding). Pamphlets may consist of a single sheet of paper that is printed on both sides and folded in half, in thirds, or in fourths, called a leaflet or it may consist of a few pages that are folded in half and saddle stapled at the crease to make a simple book.
For the "International Standardization of Statistics Relating to Book Production and Periodicals", UNESCO defines a pamphlet as "a non-periodical printed publication of at least 5 but not more than 48 pages, exclusive of the cover pages, published in a particular country and made available to the public" and a book as "a non-periodical printed publication of at least 49 pages, exclusive of the cover pages". The UNESCO definitions are, however, only meant to be used for the particular purpose of drawing up their book production statistics.[1]