Optical instruments 1950  proceedings of the London Conference on Optical Instruments 1950 

 - London  Chapman and Hall  1951 
 - [various pagings.] 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy and astrophysics thesaurus<br/>Optical instruments<br/>Optics
<br/><br/><label>Universal Decimal Class. No.: </label>535.8(082.1)  / OPT