nationalacademies.org
National Academies chapter explaining deep-web content, discovery limits and information retrieval.
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Published directory entries matching your search.
idtheftcenter.org
Identity Theft Resource Center database documenting publicly reported US data compromises.
rosap.ntl.bts.gov
National Transportation Library record for research on discovering and cataloging hidden-web resources.
rand.org
RAND study of illicit online markets and the operational lessons they present for public policy.
sizeof.cat
Research article cataloging ransomware leak sites and explaining how their status is tracked.
arxiv.org
Research paper on integrating data from web databases that are not directly indexed by search engines.
onlinelibrary.london.ac.uk
University guide to finding databases and information that ordinary search engines do not index.