@article{3430,
      recid = {3430},
      author = {Kenn, Thomas M.},
      title = {Sturgis Formation (Upper Pennsylvanian), a new map unit in  the western Kentucky coal field,},
      publisher = {U.S. Govt. Print. Off.,},
      address = {Washington,},
      pages = {iii, B1-B24 p.},
      year = {1973},
      url = {http://library.usi.edu/record/3430},
}