Clarkson, E. N. K. (Euan Neilson Kerr), 1937- <br/><br/>
Invertebrate palaeontology and evolution / 
Clarkson, E. N. K. (Euan Neilson Kerr), 1937- 
 - xiii, 382 p. ill. ; 24 cm. 
<br/><br/><label>ISBN: </label>0045600104 
<br/><br/><label>Dewey Class. No.: </label>562