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Quantitative handling of characters useful in snake systematics with particular reference to intraspecific variation in the ringed snake Natrix natrix (L).

by Thorpe, R. S:

London: Linnean Society of London, 1975. . 1st edn. Roy. 8vo pp. 27-43. Stapled self wrappers, figs 1-6. Light water stains to lower margins, otherwise in good condition. (Extract from Biol. J. Linn. Soc., Vol. 7, No. 1). . …