A revision of the North American freshwater snail genus Fontigens (Prosobranchia:Hydrobiidae) /
Hershler, Robert.
A revision of the North American freshwater snail genus Fontigens (Prosobranchia:Hydrobiidae) / Robert Hershler, John R. Holsinger, and Leslie Hubricht. - Washington, D.C. : Smithsonian Institution Press, 1990. - III, 49 p. : ill. ; 28 cm. - Smithsonian contribution to zoology ; 509 .
A revision of the North American freshwater snail genus Fontigens (Prosobranchia:Hydrobiidae) / Robert Hershler, John R. Holsinger, and Leslie Hubricht. - Washington, D.C. : Smithsonian Institution Press, 1990. - III, 49 p. : ill. ; 28 cm. - Smithsonian contribution to zoology ; 509 .