Haslett, Arthur Woods. <br/><br/>
Unsolved problems of science  / 
by A. W. Haslett ... 
 - 3rd ed. 
 - London :  The scientific Book Club ,  1939 
 - 2p. 1., [ix] - xi, 317, [1] p. :  ill. (maps), diagrs. ;  20cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science
<br/><br/><label>Dewey Class. No.: </label>500 HAS