J.B.Sidgwick <br/><br/>
Observational Astronomy for Amatyeurs 
J.B.Sidgwick 
 - London  Faber and Faber Limited  1948 
 - 358 p.tab.fig. 
<br/><br/>pp.311-339 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy
<br/><br/><label>Subjects--Index Terms: </label>Astronomy 
<br/><br/><label>Dewey Class. No.: </label>B501S57f297