Ritter, Michael E. <br/><br/>
Earth online :  an Internet guide for earth science / 
Michael E. Ritter. 
 - Belmont, CA :  Wadsworth Publishing Co.,  1997. 
 - xvi, 264 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/> Open access. 
<br/><br/><label>ISBN: </label>0534517072 
<br/><br/><label>LCCN: </label>9634516  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Earth sciences--Computer network resources.<br/>Internet.