@article{226552,
      note = {Includes index.},
      author = {Gordon, Mackenzie, and Yochelson, Ellis L.},
      url = {http://library.usi.edu/record/226552},
      title = {Gastropoda, Cephalopoda, and Trilobita of the Amsden  Formation (Mississippian and Pennsylvanian) of Wyoming /},
      publisher = {U.S. Govt. Print. Off.,},
      recid = {226552},
      pages = {iii, 30 p. :},
      address = {Washington :},
      year = {1975},
}