we also find out and in the words of the added so, that john underwood within the group hitchins. as a young grad student at the time, i was very much taken by the content of this ad. i realized that there wasn't really anything else they are better just this this kind of cooperation between our runaway slave and a poor white man. and that was what i decided to do to write this book. >> outshooting people talk about that relationship so much? >> the textbook industry is a tricky one. because there is so much to cover that you really have to go with words of major flow of the narrative runs. the kinds of cases that we're finding here are not in a really exceptional, but they are also complicated. and textbooks often times head towards the lowest common denominator. and that is really how we wind up losing a lot of our history. >> interviews from beaumont,

and the master who placed this ad believed that john underwood and his runaway slave were working the gold mines of member lin berg county together in secret at night. and the ad says, we find out that john underwood or the shoe maker which would not have been a very prestigious occupation, we also find out that he was -- and this is the words of the ad itself -- that john underwood was fond of lying and negro -- kitchens. and as a young grad student at the time, i was very much taken by the content of this ad. and i realized that there wasn't really anything out there that addressed this kind of cooperation between a runaway slave and a poor white man. and that was what i decided to do for this book. >> why don't you think people talk about that kind of relationship so much? >> the textbook industry is a tricky one because there's so much to cover that you really have to kind of go with where the major flow, where the major narrative runs. the kinds of cases that we're finding here, they're not entirely exceptional, but they're also complicated. and textbooks oftentimes head toward t