OMG have you done your homework, a tip of the hat to you. Check out the internet archive, search boxing, Dempsey's book is on there. Also there are others. If you like Dempsey's book, check this one out, http://archive.org/details/BoxingByP...phiaJackOBrien
Here is a short bio on O'brien he weighed between 152-165pds and fought everybody ck out the who's who of the time that he fought. http://www.cyberboxingzone.com/boxing/obrien.htm
Hope you find it interesting, enjoy.