Bibliography

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Old MC.  1933.  Contribution to the biology of fresh-water sponges (Spongillidae). Papers of the Michigan Academy of Science, Arts and Letters. 17:663-679.
Old MC.  1933.  Observations on the Sisyridae (Neuroptera). Papers of the Michigan Academy of Science, Arts and Letters. 17:681-684.
Old MC.  1932.  Environmental selection of the fresh-water sponges (Spongillidae) of Michigan. Transactions of the American Microscopical Society. 51:129-136.
Old MC.  1932.  Taxonomy and distribution of the fresh-water sponges (Spongillidae) of Michigan. Papers of the Michigan Academy of Science, Arts and Letters. 15:439-476.