@article{55073,
      recid = {55073},
      author = {Jahn, Theodore Louis,},
      title = {How to know the Protozoa; a pictured-key for identifying  the more common fresh water, marine, and parasitic  Protozoa, with elementary discussions of the importance of  each group and of interesting facts concerning them,},
      publisher = {W. C. Brown},
      address = {Dubuque,},
      pages = {234 p.},
      year = {1949},
      url = {http://library.usi.edu/record/55073},
}