The threshold of space :  the proceedings of the Conference on Chemical Aeronomy, Cambridge Mass., 25-28 June 1956 / 
edited by M. Zelikoff. 
 - London :  Published by the Symposium Division, Pergamon Press,  c1957. 
 - xi, 342 p. :  ill. ;  26 cm. 
<br/><br/> Sponsored by Geophysics Research Directorate of the Air Force Cambridge Research Centre, Air Research and Development Command coordinated by Wentworth Institute.  Includes index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Atmosphere, Upper --Congresses. <br/>Atmosphere --Congresses. 
<br/><br/><label>Dewey Class. No.: </label>551.514  / THR 1957