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1889. The Fluid Emitted by Limnsea Stagnalis. Journ. Conch., VI, p. 122. 

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Williamson, A. E. 



1861. Note on Land and Fresh Water Shells collected in the Environs of 

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Wiswall, Mrs. E. C. 



1897. Shells of Southern Wisconsin. Nat. Sci. Journ., I, No. 2, pp. 47-48. 

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1879. Notes on the Lcess. Muscatine Tribune, 1879. Read before Muscatine 

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