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NIST Physics Laboratory Physical Reference Data
Physics and chemical reference data from the National Institute of Standards and Technology.
Durham HEP Databases
High energy physics databases at Durham University (UK): reactions (cross-sections, structure functions), experiments, email addresses.
Wolfram|Alpha contains a wealth of physics data, and provides you with computed results in the context of a given search. Wolfram|Alpha is an effective learning tool for students looking for ways to learn and test their knowledge of physics basics.