The Dewey system was developed in 1876 by Melvil Dewey and allows for unlimited expansion possibilities and cataloging generally keeps different subjects together in physical locations. This system allows smaller libraries to use more general categories, while keeping the whole system of rule, in all libraries.
The first half of the 20th Century was dominated by the use of Dewey, but he started in the 1960s, and a change should be based on the use of the Library of Congress system, because the claim of conscience that Dewey failed in two respects. The first is that they do not deal with shared libraries with Pound at two different locations, and the second is that any new issues that have not been easy in the catalog, without major changes to the system. The subjects were chosen long ago, and many new books must fit certain categories. The themes available are not all the shares of common interest, as they did before.
The Library of Congress system develops over time and was more than one person as the Dewey system was created and at the same time. The first part of the LC system was developed in 1898. The LC system consists of 21 main groups, without the letters I, O, W, X and Y. A second letter contains is represented used to discuss the issue further and even a third letter is in the right category used to specialize. Used after the third character is a decimal point and an infinite number of categories can be used.
Another division is the Universal Decimal Classification (UDC), principally in Europe, Japan, Russia will be used, and Latin America. This system has been done on the fifth edition of the Dewey Decimal Classification and was first presented in 1895 by bibliographers Paul Otlet and Henri La Fontaine. This classification has been, is that it has been used primarily for the identification of a document used to find the content and not only able to document how the CSD is primarily for.
Book catalogs were between 16 and 18 People’s Century. They were portable and inexpensive to make, but difficult to update. Book catalogs replaced card catalogs in the late 19th Century. They were popular until the 1990s. Three types of cards are generally used for each item in the library. The first type is the name of the author in the first row. The second type had the title in the top row. The third type is the subject of the article in the top row. Superior card catalogs were book catalogs more than one person could use both and new records could be easily integrated into the drawers. It was even easier to use in 1901 when the Library of Congress began selling copies of its catalog cards to other libraries. There were 5738 subscribers mapping in 1935.
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