• ABC Interactive World Fact Book
• American Fact Finder
  From the US Census Bureau.
• CIA World Factbook
• Country Studies: Area Handbooks
  "A continuing series of books prepared by the Federal Research Division of the Library of Congress under the Country Studies/Area Handbook Program sponsored by the Department of the Army. This online series presently contains studies of 100 countries."
• The Handbook of Texas
  "A multidisciplinary encyclopedia of Texas history, geography, and culture. It comprises more than 23,000 articles on people, places, events, historical themes, institutions, and a host of other topic categories...accessible articles that provide factual, nonpartisan accounts on virtually every aspect of Texas history and culture."
• U.S. Bureau of Labor Statistics Occupational Outlook Handbook

(updated 10/8/2015)