Schneider, Leo. <br/><br/>
Exploring the universe. 

 - London :  Macmillan,  1967. 
 - Quantum books ;  no. 3 .
<br/><br/> First published in 1961. 
<br/><br/>Bibliography: p. 108. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy -- Observations.--Astronomy -- Observations.<br/>Astronomy -- Observers' manuals.--Astronomy -- Observers' manuals.