@article{1553602,
      recid = {1553602},
      author = {Boustan, Leah Platt, and Frydman, Carola, and Margo,  Robert A.},
      title = {Human capital in history : the American record /},
      pages = {1 online resource (419 pages) :},
      url = {http://library.usi.edu/record/1553602},
}