@article{121856,
      recid = {121856},
      author = {Tidball, Ronald R. and Tidball, Ronald R.},
      title = {Geography of soil geochemistry of Missouri agricultural  soils ; Geochemical classification by factor analysis of  Missouri agricultural soils /},
      publisher = {U.S. G.P.O. ;},
      address = {Washington :},
      pages = {1 v. (various pagings) :},
      year = {1984},
      url = {http://library.usi.edu/record/121856},
}