Haas, F. 1910. Die Unioniden. [in] H.C. Küster, Systematisches Conchylien-Cabinet von Martini und Chemnitz 9 (pt. 2, h. 41): 1-16, pls. 1-6. Available electronically.

Haas, 1910. Conch. Cab. 9 (pt. 2, h. 41): 71, pl. 6, fig. 2.
(intro'd as intra-sp. of Unio douglasiae Griffith & Pidgeon, 1833)
Type(s): TYPE SMF_3654, W. Ufer d. Sees Buirnor, O. Mongolei, Amur-Geb.
‘Lea’ of Authors.
Dautzenberg & Fischer, 1905. J. de Conch. 53: 202.
Haas, 1910. Conch. Cab. 9 (pt. 2, h. 41): 44, pl. 4b-c.
(reference to Unio grayanus Lea, 1834)