Kier, Porter M <br/><br/>
Triassic echinoids 
/ Porter M. Kier 
 - Washington  Smithsonian Institution Press  1977 
 - iv, 88 p. : ill. ; 26 cm. 
 - Smithsonian contributions to paleobiology ; no.30. .
<br/><br/> Includes index. 
<br/><br/>Bibliography: p. 39-41. 
<br/><br/><label>LCCN: </label>76-024806 //r892 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sea urchins, Fossil<br/>Paleontology--Triassic