@article{195734,
      recid = {195734},
      author = {Langer, William H. and Knepper, Daniel H.},
      title = {Geologic characterization of natural aggregate a field  geologist's guide to natural aggregate resource assessment  / [microform] :},
      publisher = {U.S. Dept. of the Interior, U.S. Geological Survey,},
      address = {[Reston, Va.] :},
      pages = {1 v.},
      year = {1995},
      note = {Distributed to depository libraries in microfiche.},
      url = {http://library.usi.edu/record/195734},
}