Investigating the earth :  teacher's manual / 
by American Geological Institute. 
 - 4th ed. 
 - Boston :  Houghton Mifflin Co.,  c1984. 
 - Various paging. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>LCCN: </label>86062084 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology--Study and teaching.<br/>Physical geology.
<br/><br/><label>LC Class. No.: </label>QE28.2  QE28  / .T37 1987  / .I5 
<br/><br/><label>Dewey Class. No.: </label>551.4