By the late 1960s such bodies of digitized alphanumeric information, known as bibliographic and numeric database systems the complete book pdf free, constituted a new type of information resource”. Online interactive retrieval became commercially viable in the early 1970s over private telecommunications networks.
The first services offered a few databases of indexes and abstracts of scholarly literature. These databases contained bibliographic descriptions of journal articles that were searchable by keywords in author and title, and sometimes by journal name or subject heading. The user interfaces were crude, the access was expensive, and searching was done by librarians on behalf of ‘end users'”. Cambridge, Massachusetts: The MIT Press.
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