Dubyago, A.D. <br/><br/>
The Determination of Orbits 

 - New York:  The Macmillan Company  1961 
 - 201p. :   il; 21 cm. 
<br/><br/> Son fotocopěas 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Orbitas