Russell, L.S. 1976. Pelecypods of the Hell Creek Formation (Upper Cretaceous) of Garfield County, Montana. Can. J. Earth Sci. 13: 365-388.
Russell, 1976. Can. J. Earth Sci. 13: 382, pl. 6, figs. 13-18.
Russell, 1976. Can. J. Earth Sci. 13: 370, pl. 1, figs. 6-9.
+ Unio vetusta ‘Meek’ of Authors
+ Unio browni Whitfield, 1903