@article{442877,
      recid = {442877},
      author = {Giorgi, John.},
      title = {Math for wastewater treatment operators grades 1 and 2 a  guide to preparing for wastewater treatment operator  certification exams / [electronic resource] :},
      publisher = {American Water Works Association,},
      address = {Denver, Colo. :},
      pages = {1 online resource (xix, 360 p.) :},
      year = {2009},
      url = {http://library.usi.edu/record/442877},
}