Research Level A collection that includes everything at 3 plus 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 researchers. It is intended to include all important reference works and a wide selection of specialized monographs, as well as a very extensive collection of journals and major indexing and abstracting services in the field. Older material is usually retained for historical research and actively preserved. Pertinent foreign language materials are included. Minor writers collected widely.
Older material is retained for historical research with active preservation efforts.
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