The former occurrence of both Helicella striata (Müller) and H. geyeri (Soós) in England
Sparks, B.W. (1953). The former occurrence of both Helicella striata (Müller) and H. geyeri (Soós) in England. J. Conch., Lond. 23(11): 372-378
In: Journal of Conchology. Conchological Society of Great Britain & Ireland: London. ISSN 0022-0019; e-ISSN 2755-3531, meer
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