xxxx 



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Froceedings. N. 295—302. London 1890, 91. 8. 

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Hollniid. 



Amsterdam. K. Akademie. 



Verbandelingeu. Deel 28. Amsterdam 1890. 4. 

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Botan. .Jaarboek. Jaarg. 1891. Gent 1891. 8. 

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Bologna. Accademia delle scienze. 



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Del meridiano iniziale e dell'ora univers. Bologna 1890. 4. 

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