darpa.mil
DARPA research program that developed domain-specific search methods for hard-to-index web content.
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arxiv.org
Research paper describing large-scale crawling and analysis methods for onion services.
slcyber.io
Research and explainers on dark-web investigations, criminal forums and threat-intelligence methods.
getty.edu
Explains how metadata and structured access affect discovery of database-backed and deep-web content.