Emberton, K. C., - Retraction/extension and measurement error in land snail: effects on systematic characters1989. In 8vo, offp., pp. 17 with 7 figs. Offprint from Malacologia 31(1) EUR 5.00 [Appr.: US$ 5.65 | £UK 4.5 | JP¥ 819] Book number 61566is offered by:
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