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Filing Order

The filing order is such that a more general text will appear before a more specialised work. UDC Numbers may be of both a simple and compound form; for example, the compound form 523.41/.43 denotes a text that covers material in the range 523.41 to 523.43, and it comes earlier on the shelf than one restricted to (say) 523.41/.42.

The following examples of filing order are for illustrative purposes only. Generally speaking, the first five digits should be sufficient to enable a user to get into the right ball-park when searching for a particular text.

In addition to numbers, books are also catalogued with letters. These appear below the class number, and are usually the first four letters of the Surname of the First Author, or the first four letters used to denote an organization. For example, INTE below the class number denotes the INTErnational Astronomical Union.

Last Revised: 2010 March 1st