Supplement to “ Nature,” April 28, 1923 ix 

Lobeck, A. K. Scientific Survey of Porto Rico and- 
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Physiography of Porto Rico. Pp. 301-384. (New York: 
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Michaelis,G. Dic Wasserbewegung an der Oberflache 
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sitat Berlin. Neue Folge. A: Geographisch-naturwissen- 
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