Clarkson,  E.N.K. <br/><br/>
Invertebrate Palaeontology and Evolution 
/ by E.N.K. Clarkson 
 - 4th ed. 
 - USA:   Blackwell Science,   1998. 
 - xiv, 452p. 
<br/><br/><label>ISBN: </label>9.7881265331e+012 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Bryozoans<br/>Earth Science<br/>Palaeontology<br/>Sponges
<br/><br/><label>Dewey Class. No.: </label>562  / CLA/I