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5. Garner, W. W., and Allard, H. A., Effect of the relative length of day 

 and night and other factors of the environment on growth and reproduction 

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7. Kraus, E. J., and Kraybill, H. R., Vegetation and reproduction with 

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8. Sachs, J. von, Physiologische Notizen. VII. tjber Wachsthumperioden 

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9. Setchell, W. A., Geographical distribution of the marine spermaphytes. 

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