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30. Perkin, A. G. and Martin, H. W. "Rhamnazin." Jour. Chem. 



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31. Perkin, A. G. "Azobenzene Derivatives of some natural Colour- 



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32. Perkin, A. G. and Pilgrim, J. A. " The Colouring Matters of 



the Indian Dye-stufF Asbarg, Delphinium Zalil.'' Jour. Chem. 

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33. Perkin, A. G. and Wood, P. J. " Yellow Colouring Principles 



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34. Perkin, A. G. and Newbury, F. G. "Colouring Matters con- 



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