Roy, A. E. <br/><br/>
Astronomy - principles and practice   
by A. E. Roy and D. Clarke. 
 - 2nd ed 
 - Bristol  Adam Hilger  1988 
 - xv, 357p 
<br/><br/><label>ISBN: </label>0852743947 
<br/><br/><label>Dewey Class. No.: </label>520  / N88