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Hey, R. W. (1955). Appendix D, Description of a new variety of snail, pp. 292-293, pl. 15 fig. d. In: C.B.M. Burney & R.W. Hey (eds), Prehistory and Pleistocene geology in Cyrenaican Libya. A record of two seasons' geological and archeological fieldwork in the Gebel Akhdar hills, with a symmary of prehistoric finds from neighbouring terrorories. Cambridge University Press, 314 pp., 16 pls.
Hey, R. W. (1955). Appendix D, Description of a new variety of snail, pp. 292-293, pl. 15 fig. d. In: C.B.M. Burney & R.W. Hey (eds), Prehistory and Pleistocene geology in Cyrenaican Libya. A record of two seasons' geological and archeological fieldwork in the Gebel Akhdar hills, with a symmary of prehistoric finds from neighbouring terrorories. Cambridge University Press, 314 pp., 16 pls.