@article{235223,
      recid = {235223},
      author = {Southwick, D. L. and Reed, John Calvin, and Mixon, Robert  B.,},
      title = {The Chopawamsic Formation-- a new stratigraphic unit in  the Piedmont of northeastern Virginia,},
      publisher = {U.S. Govt. Print. Off.,},
      address = {[Washington,},
      pages = {iii, 11 p. :},
      year = {1971},
      url = {http://library.usi.edu/record/235223},
}