Hershler, Robert. <br/><br/>
Arizona Hydrobiidae (Prosobranchia:Rissoacea) / 
Robert Hershler and J. Jerry Landye. 
 - Washington, DC :  Smithsonian Institution Press,  1988. 
 - Smithsonian contributions to zoology ;  no. 459 .
<br/><br/>Bibliography: p. 63. 
<br/><br/><label>LCCN: </label>87600195 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pyrgulopsis -- Arizona -- Classification.--Pyrgulopsis -- Arizona -- Classification.--Pyrgulopsis -- Arizona -- Classification.<br/>Tryonia -- Arizona -- Classification.--Tryonia -- Arizona -- Classification.--Tryonia -- Arizona -- Classification.<br/>Mollusks -- Classification.--Mollusks -- Classification.<br/>Mollusks -- Arizona -- Classification.--Mollusks -- Arizona -- Classification.--Mollusks -- Arizona -- Classification.
<br/><br/><label>LC Class. No.: </label>QL1  / .S54 no. 459