"brought to more than five million the number of Americans who've had their working hours reduced":
www.zmag.org/znet/viewArticle/18332

Military Assistance Command, Vietnam Studies and Observations Group:
en.wikipedia.org/wiki/Military_Assistance_Command,_Vietnam_Studies_and_Observations_Group

History of the Grand Canyon:
www.nytimes.com/books/first/p/pyne-canyon.html