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34. Palmgrex, a. Chance as an element in Plant Geography. 



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36. Perkixs, J. Styraceae. Pflanzenreich, 1907. 



37. Monimiaceae. Pflanzenreich, 1907. 



38. Ridley, H. X. The Dispersal of Plants throughout the World. 



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42. Shipley, A. E. Life. Cambridge, 1923. 



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44. Taxsley, a. G. Types of British Vegetation. Cambridge, 1911. 



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47. TuRRiLL, W. B. The Plant Life of the Balkan Peninsula. 



48. DE Vries, H. The Mutation Theory (Engl. ed.). London, 1910. 



49. Waxgerix, W. Cornaceae. Pflanzenreich, 1910. 



50. Wext, F. a. F. C. Ueber Zwecklosigkeit in der lebenden Natur. 



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51. Willis, J. C. A re\ision of the Podostemaceae of India and Ceylon. 



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54. The Origin of the... Podostemaceae. Ann. Bot. xxix, 1915, 



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55. The Evolution of the... Podostemaceae. Ann. Bot. xl, 



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