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1906. LOCK, R. H., Plant Breeding in the Tropics. 777, Ex- 

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1906. MACOUN, W. T., The Improvement of the Potato. Can. 

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1906. MORGAN, T. H., Are the Germ-cells of Mendelian Hybrids 

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1906. MUNSON, W. M., Plant-breeding in its Relation to Ameri- 

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1906. ORTMANN, A. E., The Mutation Theory Again. Science, 

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1906. OSTERHOUT, W. J. V., Experiments with Plants, x + 

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1906. PEARL, RAYMOND, Variation in the Number of Seeds of 

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1906. RAUNKIAER, C., Transmission par heredite dans les 

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1906. RIVIERE, G., and BAILHACHE, G., Influence du porte- 

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1906. ROSENBERG, 0., Embryobildung in der Gattung Hieracium. 

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190|6. SAAME, 0., Kernverschnelzung bei der karyokinetischen 

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1906. SCHARF, E., Keimkraft-Apparat. Deutsch. landw. 

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1906. SCHULTE, J. I., Corn Breeding Work at the Experiment 

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1906. SOLMS(-LAUBACH), H. GRAF zu, Cruciferenstudien. 

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