The Wayback Machine - https://web.archive.org/all/20040113012423/http://www.gils.net:80/showcase/distrib.html

Distributed Search

It is not practical to perform comprehensive gathering of information "just in case" you may need it. Even the "all of Web" search engines only sample large sources and often are very out-of-date. An ideal distributed search would not use copies of out-of-date indexes but search all the right sources "just in time" to answer a specific searcher. Given the variable reliability and performance of the public Internet, most distributed searches currently attempt only a few sites at a time.

Ecological Monitoring and Assessment Network | - operates a distributed "national data set library"
National Geospatial Data Clearinghouse | - provides a single search across a Clearinghouse with 200+ collections of geospatial metadata
Before | and After | - in the context of instituting a U.S. Federal Government Information Clearinghouse

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