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I changed the order of the sections because they were not in alphabetical order —Preceding unsigned comment added by 83.165.186.232 (talk) 13:56, 2 January 2011 (UTC)[reply]
This article seems to be too USA dominated. Pioneers are to be found all over the world and at all times. --Bduke (talk) 11:35, 21 June 2023 (UTC)[reply]
