Ritter <br/><br/>
Earth on Line an Internet Guide for Earth Science 
Michael E. Ritter 
 - Belmont, USA  Wadsworth Publishing Company  1978 
 - xvi,264p.  ill.  24 cm 
<br/><br/><label>ISBN: </label>0534517072 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Earth Sciences--Computer Network Resources<br/>Internet [Computer Network]