1) Inge N. Dobelis (Project Editor) et al: America: Land of Beauty and Splendor (New York, USA: The Reader's Digest Association, 1992)
2) Alma E. Guinness (Project Editor) et al: America A to Z (New York, USA: The Reader's Digest Association, 1997)
3) Laura Sutherland with Family Travel Forum: “Amazing Places to Take Your Kids” (Illinois, USA: Publications International, Ltd., 2008)
4) “Our National Parks  -  Celebrating
America’s Nature Splendor”, Life 9 (2009) No. 7 August 21
5) History of States in the U.S.

6) World Atlas
7) About the US
8) Yahoo Travel
9) Wikipedia
10) FactMonster
11) 50 States

12) Infoplease

13) Top 10 Museums in the United States

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