Spectral classification and multicolour photometry :  Symposium No. 50 held in Villa Carlos Paz, Argentina, October 18-24, 1971. / 
Ed. by Ch. Fehrenbach, B. E. Westerlund. [Organized by the] International Astronomical Union. 
 - Dordrecht ;  Boston :  D. Reidel Publ. Co.,  1973. 
 - xiv, 314 p. :  ill ;  25 cm. 
<br/><br/>Includes bibliogr. references 
<br/><br/><br/>English or French 
<br/><br/><label>ISBN: </label>9027702802 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Stars--Spectra--Classification--Congresses.<br/>Astronomical photometry--Congresses.