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If you are into reading motorcycle magazines this is a goldmine!!! All the American Motocycling issues from 1950 to 2007 are online at:
http://books.google.com/books?id=_PsDAAAAMBAJ&hl=no&source=gbs_navlinks_s#all_issues_anchorI personally loved the 1970 may issue with a nice story about a CB750 that won the Daytona 200.
Check it out! There is literally 100 of hours of reading.