How does one identity/define the various book genres?

<a rel="nofollow" href="http://www.booknutsreadingclub.com/genrelist.html">http://www.booknutsreadingclub.com/genrelist.html</a> Non-fiction All of the information in a non-fiction book is based on the known true facts. Nothing can be made up. Non-fiction books include how-to books, science books, history books, biographies, autobiographies and much more. Non-fiction books can be about any subject. Biography A biography is the story of a real person's life, written or told by another person. Biographies may be located in a section of their own in some libraries and may be labeled B for biography or use the Dewy Decimal System Classification number of 92 and then are listed in alphabetical order by who the book is about. Biographies of 2 or more people in the same book use the Dewey Classification number of 920. Other libraries prefer to place biographies in the Dewey Decimal Classification according to the subject of what the person did -- for example biographies of artists would be ...  more