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Exploring and Collecting History Online (Echo) has been actively collecting the history of science, technology, and industry since 2001. This directory includes links to over 5,000 sites. Each site includes a brief description, and a number of sites are also reviewed. Browse by Category (e.g. Business and Industry, Consumer Technology, or Philosophy of Science), by Historical Period (such as Ancient, Modern, or Middle Ages), or by Content (Primary Source and Secondary Source, Educational, or Artifacts, among many others). In addition, Search and Advanced Search options will please those of us accustomed to academic archives and web resources.
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