@article{75753,
      author = {Litwack, Leon F.},
      url = {http://library.usi.edu/record/75753},
      title = {North of slavery; the Negro in the free States,  1790-1860.},
      publisher = {University of Chicago Press},
      recid = {75753},
      pages = {318 p.},
      address = {[Chicago]},
      year = {1961},
}