@article{NARMS:SourceID:43850, author = {Alder, J.}, journal = {Transactions of the Tyneside Naturalists' Field Club}, pages = {358-365}, title = {Additions to the Mollusca of Northumberland and Durham}, url = {http://biodiversitylibrary.org/page/33670338}, volume = {1}, year = {1850} }