@article{217372,
      note = {Relief shown by contours and spot heights.},
      author = {Helley, Edward J.},
      url = {http://library.usi.edu/record/217372},
      title = {Preliminary contour map showing elevation of surface of  Pleistocene alluvium under Santa Clara Valley, California  [microform] /},
      publisher = {The Survey ;},
      recid = {217372},
      pages = {1 map ;},
      address = {[Reston, Va.?] :},
      year = {1991},
}