Sometimes it's hard to decide whether a source is trustworthy. Here are a few places where you can be reasonably sure you are finding solid information.

• Catalog of U.S. Government Publications (CGP)
  GPOaccess.gov: U.S. Government Printing Office
  
  
• The Pew Charitable Trusts
  
  
  
• Gallup Organization
  
  
  
• National Institutes of Health
  
  
  
• National Science Foundation
  
  
  
• U.S. Geological Survey
  
  
  
• Encyclopedia Smithsonian
  Smithsonian Institution
  
  
• National Geographic
  
  
  

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