the library of congress classification system is divided into how many sections
In 1899, the United States Library of Congress created a classification scheme for books. It is called the Library of Congress Classification system (LC for short). In this system, all knowledge is divided into 21 broad subject areas by letters of the alphabet (I, O, W, X, and Y are not used).wo systems commonly used in the United States are the Library of Congress Classification (LC) system, and the Dewey Decimal Classification (DDC) system. 1  Library of Congress Classification System. 2  Call numbers. 3  Shelf order. 4  Collection codes.