Astro / 

 -  Canadian ed. 
 - United states  Nelson  c2013 
<br/><br/><label>ISBN: </label>9780176503772 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy--Textbooks.
<br/><br/><label>LC Class. No.: </label>QB 61  / .A87 2012