The study of trace fossils  a synthesis of principles, problems, and procedures in ichnology 
edited by Robert W. Frey 
 - New York  Springer-Verlag  1975 
 - xiv, 562 p. : ill. ; 27 cm. 
<br/><br/>Includes bibliographies and index. 
<br/><br/><label>ISBN: </label>0387068708 
<br/><br/><label>LCCN: </label>74-030164 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trace fossils