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1. Minimal Level:
A subject area in which few selections are made beyond very basic works.
2. Basic Level:
A selective collection of materials that serves to introduce and define
a subject and to indicate varieties of information available elsewhere.
It may include dictionaries, encyclopedias, historical surveys,
bibliographies, handbooks, e.g. The collection is frequently and
systematically reviewed for currency of information.
3. Study or Instructional Level:
A collection that is adequate to impart and maintain knowledge about a
subject in a systematic way but a level of less than research intensity.
The collection includes a wide range of basic works in appropriate
formats, a significant number of classic retrospective materials,
complete collections of the works of more important writers, selections
of the works of secondary writers and
the reference tools and fundamental bibliographical apparatus pertaining
to the subject.
4. Research Level:
A collection which includes the major published source materials
required for dissertation and independent research, including materials
containing research reporting, new findings, scientific experimental
results, and other information useful to search. It is intended to
include all important reference works and a wide selection of
specialised monographs in the field. A collection at this level supports
doctoral and other original research.
5. Comprehensive Level:
A collection in which information center endeavours, so far as is
reasonably possible, to include all significant works of recorded
knowledge (publications, manuscripts, other forms) in all applicable
languages, for a necessarily defined and limited field
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