Library of Congress Classification System: Brief OutlineThe Library of Congress Classification System organizes material in libraries according to twenty-one branches of knowledge (listed below).The 21 categories (labeled A to Z, but not including I, O, W, X and Y) are further divided by adding one or two additional letters and a set of numbers. This system is in use at the Library of Congress and at many academic and research libraries in Canada and the United States. Classes are broken down into sub classes by combinations of additional letters. Example T = Technology, with TK = Electrical engineering (technology). Sub classes are further broken down using a numbers. This systems puts books on the same topic together, side by side on the shelves. An example would be books on telecommunications in the TK 5101 section, where telecommunications (5101) is seen as a sub class of electrical engineering (TK), which is a sub class of technology (T). A - General Works B - Philosophy, Psychology, Religion C - Auxiliary Sciences of History D - History: General and outside the Americas E - History: United States F - History: United States Local and America G - Geography H - Social Sciences J - Political Science K - Law L - Education M - Music N - Fine Arts P - Language and Literature Q - Science R - Medicine S - Agriculture T - Technology U - Military Science V - Naval Science Z - Library Science
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