46 THE PHYSICAL FEATURES OF ST. MARt's COUNTY 



1882. 



Heilprin, Angelo. On the relative ages and classification of the 

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Proc. Acad. Nat. Sci., Phila., vol. xxxiv, 1SS2, pp. 150-186. 



(Abst.) Amer. Jour. Sci., 3 ser., vol. xxiv, 1SS2, pp. 228-229. Amer. Nat., 

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1881. 

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Jour. Acad. Nat. Sci., Phila., 2 ser., vol. ix, 1884, pp. 115-154, map. 



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the United States. 4to. 117 pp., map. Phila., 1881. 



Eau, Chas. Prehistoric FLshing in Europe and ISTortli America. 

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1885. 

 Williams. Jr. A. (Editor). Infusorial Earth. 

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1888. 



Cl.ark, Wir. B. On three Geological Excitrsions made during the 

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Johns Hopkins Univ. Cir. No. 63, vol. vii, 1888, pp. 05-67. 



Uhler, P. E. Observations on the Eocene Tertiary and its Cretaceous 

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Trans. Md. Acad. Sci., vol. i, 1888, pp. 11-32. 



1890. 

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1891. 



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