getty.edu
Explains how metadata and structured access affect discovery of database-backed and deep-web content.
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idtheftcenter.org
Identity Theft Resource Center database documenting publicly reported US data compromises.
arxiv.org
Longitudinal study measuring unique Tor onion services while accounting for mirrors and topology bias.
onlinelibrary.london.ac.uk
University guide to finding databases and information that ordinary search engines do not index.