@article{200771,
      note = {Distributed to depository libraries in microfiche.},
      author = {Ham, Lisa K.},
      url = {http://library.usi.edu/record/200771},
      title = {Hydrogeologic data for Graces Quarters, Aberdeen Proving  Ground, Maryland [microform] /},
      publisher = {U.S. Geological Survey ;},
      recid = {200771},
      pages = {iv, 68 p. :},
      address = {Towson, Md. :},
      year = {1991},
}