Investigating the earth / 
Earth Science Curriculum Project 
 - Boston :  Houghton Mifflin,  1972 
 - xiv, 594 p. :  ill., maps, ports. ;  26 cm. 
<br/><br/> Sponsored by the American Geological Institute; supported by the National Science Foundation. 
<br/><br/>Includes bibliographies. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Earth sciences<br/>Earth