418 



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61375 



Ueber die Best immung des 



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Ruth, Warren A. v. McPhcrson, W. 



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Present problems of 



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The production and origin 



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I)er L^rsprung des Ra- 



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Some properties of the 



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Experiments with the 



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and Geiger, H[ans]. I An 



electrical method of counting the num- 

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The chirge and nature 



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md Petavel, J. E. The 



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Rutherford, E[rnestj and Royds, T. 



The nature of the a-par(i(!c. Man- 

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Spectrum of the radium 



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• The action of the 



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Rutten, Jan. Zwavelbepaling in 

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61390 



Over naphtalinebepaling 



in steenkolengas. [Ueber Naphtalin- 

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Rfizidka, Vladislav. Zur Kenntnis 

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Ryan, Hugh and Ebrill, George. The 

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Rykowskow, A. v. Zemczuzny, S. 



Rywosch, S. Zur Stoffwanderung im 

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61394 



Saal, A. Das Albuminpapier in der 

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61395 



Saal, Alfr. Die Photographic in den 

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Saalfeld, Edmund. Oscir Liebreichf. 

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Sabanejev v. Sapoznikov, A. V. 



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V. Lohnis, F. 



