@article {619,
	title = {Effects of atmosheric pollution on the distribution of Balea perversa (Linnaeus) (Pulmonata:Clausiliidae) in southern Britain},
	journal = {Journal of of Conchology },
	volume = {29},
	year = {1987},
	pages = {319-323},
	author = {Holyoak, D.T.}
}
