WVU Tech Library organizes its book collections using the Library of Congress Classification System. This is an alpha-numeric hierarchical system in which all knowledge is divided into 21 main classes. Each main class is identified by a single letter. For example, World History is classed under D. See the outline below. Subclasses of knowledge are then broken down and identified by two-letter arrangement. For example, books about the History of Great Britain are classed under DA. Topics are assigned whole numbers. An example would be DA129-260 are books covering Early and Medieval to 1485; and subtopics are given decimal numbers combined with a letter and is known as the cutter line.
D E E
D = World History E = America E = America