Study guide for life on earth. 

 - 2nd ed. / prepared by P.S. Associates with Carl S. Pike.  2nd ed. / prepared by P.S. Associates with Carl S. Pike. 
 - Sunderland, MA :  Sinauer Associates,  [1978] 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Life -- Problems, exercises, etc.--Life -- Problems, exercises, etc.