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Mass Media Mass media here means communication through a number of physical transmission modes such as print, visual, audio, audio-visual and electronic forms to a general mas
Special Features Most ready reference sources are of specific frequency i.e. annual, biennial, or published at specific or irregular interval. They are referred to answer fac
Levels of Subject Authority Control Subject authority control is exercised at two levels: central and local. At the central level, a central agency (e.g. Library of Congress)
Standard Vocabulary As LCSH is the official list of Library of Congress, not only does it give an authority to the standard vocabulary of LC, but also maintains its utility,
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Informational Almanacs Informational almanacs are basic general almanacs. They depend heavily on government sources for statistical information. They follow the same pattern
Merits and Deficiencies The strongest aspect of LCSH is that it represents subject headings of a national library, one of the most richest of national libraries of the world.
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Content Designator Content designators are used to denote the identity of each data field (instead of identifying data fields by position) within a record. It may be grouped
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