How are library books organised in a library?

Answer:
Generally, fiction (i.e. novels) are arranged alphabetically by the author's last name, and non-fiction (i.e. books on specific topics) are arranged by subject categories. The most well-known subject classification scheme is probably the Dewey Decimal System, but there are others such as Library of Congress, UDC, etc.
First answer by Redshoes7. Last edit by Redshoes7. Contributor trust: 1 [recommend contributor recommended]. Question popularity: 2 [recommend question].