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Federated search portal querying science databases and repositories across many countries.

Explains federated searching across government science databases often described as the deep web.

ERIC record for a guide to finding specialized databases and other web content missed by search engines.

University guide to finding databases and information that ordinary search engines do not index.

Guide to search tools and databases that surface information outside conventional web indexes.

National Academies chapter explaining deep-web content, discovery limits and information retrieval.

Research study on identifying and understanding search interfaces that expose hidden-web databases.

Research paper on integrating data from web databases that are not directly indexed by search engines.

Explains how metadata and structured access affect discovery of database-backed and deep-web content.

National Transportation Library record for research on discovering and cataloging hidden-web resources.

Research paper on finding and organizing scholarly databases within the academic invisible web.

Research archive containing dark-web authorship verification datasets and baseline models.

Official archive of older Tor software, websites, mailing lists, reports and project material.

Archive of Tor Project monthly reports documenting development, research and community activity.

Historical public mailing-list messages documenting Tor development, research and relay operations.

WikiLeaks archive for searching the Sony email release and related historical documents.

Historical visualization and research record mapping a sample of linked Tor onion services.

Historical lookup showing whether an IP address appeared as a Tor relay on a specified date.

Public-interest archive preserving leaked and released datasets for journalism and historical research.

Official Tor archive providing recent and historical network descriptors for reproducible research.

Reporting archive on dark-web crime, underground forums, data leaks and law-enforcement actions.

Research and explainers on dark-web investigations, criminal forums and threat-intelligence methods.

Research covering cybercriminal communications, darknets, underground forums and financial crime.

Research article cataloging ransomware leak sites and explaining how their status is tracked.