Trouble from Ragwort

The Pyrrolizidine Alkaloids

Their Chemistry, Pathogenicity and other Biological Properties. By L. B. Bull, C. C. J. Culvenor and A. T. Dick. (North-Holland Research Monographs. Frontiers of Biology, Vol. 9.) Pp. xv + 293. (North-Holland: Amsterdam, 1968.) 117s.

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CLARKE, E. Trouble from Ragwort. Nature 223, 870 (1969).

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