Campbell, William Wallace, <br/><br/>
Elements of practical astronomy.- 2nd. rev. ed. 
by W. W. Campbell. 
 - 2nd. rev. ed. 
 - London,  Macmillan,  1922. 
 -  264p. 
<br/><br/><label>Subjects--Index Terms: </label>Astronomy 
<br/><br/><label>Universal Decimal Class. No.: </label>51-71  / CAM