@article {WALKER1918,
	title = {{A synopsis of the classification of the fresh-water Mollusca of North America, north of Mexico, and a catalogue of the more recently described species, with notes}},
	journal = {University of Michigan Museum of Zoology Miscellaneous Publications},
	volume = {6},
	year = {1918},
	pages = {1{\textendash}213},
	author = {WALKER, B}
}
