@article{1363239,
      recid = {1363239},
      author = {Leppien, Jann H., and Purcell, Jeanne H.,},
      title = {Parallel curriculum units for science, grades 6-12 /},
      pages = {1 online resource (ix, 229 pages) :},
      url = {http://library.usi.edu/record/1363239},
}