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Czarnecki, D.B. & Cawley, E.T. (1997). A new species of Pinnularia (Pinnulariaceae) from Iron rich, highly acidic strip-mined coal pits of South-Central Iowa. Proceedings of the Academy of Natural Sciences of Philadelphia. 147: 111-117.
Czarnecki, D.B. & Cawley, E.T. (1997). A new species of Pinnularia (Pinnulariaceae) from Iron rich, highly acidic strip-mined coal pits of South-Central Iowa. Proceedings of the Academy of Natural Sciences of Philadelphia. 147: 111-117.
