@article{122917,
      recid = {122917},
      author = {Severson, R. C. and Shacklette, Hansford T.},
      title = {Essential elements and soil amendments for plants :  sources and use for agriculture /},
      publisher = {Dept. of the Interior, U.S. Geological Survey ;},
      address = {[Reston, Va.?] :},
      pages = {iii, 48 p. ;},
      year = {1988},
      note = {"Geologic and incidental sources of elements essential for  plant growth, and amendments used to improve physical  properties of soils."},
      url = {http://library.usi.edu/record/122917},
}