Koestler, Arthur. <br/><br/>
The watershed :  a biography of Johannes Kepler / 
[by] Arthur Koestler. 
 - [London] :  Heinemann,  [c1960]. 
 - 280 p. :  ill. ;  20 cm. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0435550209 
<br/><br/><label>Subjects--Personal Names: </label><br/>Kepler, Johannes, 1571-1630.
<br/><br/><label>Subjects--Topical Terms: </label><br/>Biography.