About.com: Inventors - Jack Johnson
Includes photos of the boxer and the wrench that he patented in 1922.
inventors.about.com/library/inventors/blwrench1.htm
SecondsOut.com: Jack Johnson
Interview with biographer Geoffery C. Ward
www.secondsout.com/USA/news.cfm?ccs=229&cs=15275&highlight=jack%20johnson
Wikipedia: Jack Johnson
Background and information on the first African American heavyweight champion, Jack Johnson.
en.wikipedia.org/wiki/Jack_Johnson_%28boxer%29