nationalacademies.org
National Academies chapter explaining deep-web content, discovery limits and information retrieval.
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Published directory entries matching your search.
rosap.ntl.bts.gov
National Transportation Library record for research on discovering and cataloging hidden-web resources.
science.gov
Explains federated searching across government science databases often described as the deep web.
worldwidescience.org
Federated search portal querying science databases and repositories across many countries.