Graphic ephemera from Expo' 70
http://homepage1.nifty.com/kitaosaka/expo2/ftop.htm
http://blog.iso50.com/16572/expo70-paraphanelia/
http://aqua-velvet.com/2010/04/logo-collection-1969/
http://somuchpileup.blogspot.co.uk/2011/02/philately-fridays-expo-70.html
http://www.gimmebadvibes.com/tctd/interviews/expo_70_answers_the_questions_of...