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Contains citations to articles from all scientific disciplines. You can search by topic, author, and title, and also by citation (i.e., look up which other articles and authors have cited an article you know about). Also called the "Science Citation Index".
Citations to technical articles on physical oceanography, geology, meteorology, non-living resources, marine biology, fisheries, and aquaculture plus environmental, technological, and legislative topics.
A large general database containing citations to both popular and scholarly articles about an enormous range of topics (not just science!). Articles found from this database will likely be less specialized than those found in science-specific databases.