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Web of Science
A huge database of scholarly literature across the sciences, strong in both historical and current coverage. Includes extensive citation mapping.
Another broad literature database with strengths in current scientific publications and citation mapping.
A large database of biomedical and related literature. It's strengths are controlled subject searching and linking with other NCBI resources.
Biosis Citation Index
Covers journals, proceedings, books, and reports in the life sciences back to 1926. Includes citation mapping.
Covers articles on all aspects of zoological research dating back to 1864. Includes citation mapping.
Some Online Reference Works