Physical and Mathematical Sciences and Technology

Dictionaries/Encyclopedias

• Academic Press Dictionary of Science and Technology
• Gale Encyclopedia of Science
• Van Nostrand's Scientific Encyclopedia

General Resources and Tools

• Conversion of Units
• Encyclopedia of Scientific Units, Weights, and Measures
• Fundamental Physical Constants from NIST

Astronomy

• Handbook of Space Astronomy and Astrophysics
• USNO Astronomical Data
• Sky and Telescope's Interactive Sky Chart
• Stars and Constellations

Chemistry

• Chemical Tradename Dictionary
• CRC Handbook of Chemistry and Physics
• Dictionary of Substances and Their Effects
• Encyclopedic Dictionary of Named Processes in Chemical Technology
• Hawley's Condensed Chemical Dictionary
• Kirk-Othmer Encyclopedia of Chemical Technology
• Ullmann's Encyclopedia of Industrial Chemistry
• WebElements Periodic Table

Engineering

• Dictionary of Engineering Terms
• Kirk-Othmer Encyclopedia of Chemical Technology
• Machinery's Handbook
• Perry's Chemical Engineers' Handbook
• Ullmann's Encyclopedia of Industrial Chemistry

Physics

• CRC Handbook of Chemistry and Physics
• Digital Encyclopedia of Applied Physics

Mathematics

• Dictionary of Appiled Math for Engineers and Scientists
• Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables

Technology

• Dictionary of Personal Computing
• Encyclopaedia on the History of Technology
• How Stuff Works