Walker, Bill O. <br/><br/>
Redshift : astronomy work book 

 - Philadelphia  Harcourt College Publishers  2000 
 - 362 p 
<br/><br/><label>ISBN: </label>0-03-026996-2 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Philadelphia
<br/><br/><label>LC Class. No.: </label>QB 45.2 .W5/