Gillham, E. J. <br/><br/>
Radiometric standards and measurements / 
E. J. Gillham. 
 - London :  H. M. Stationery Office,  1961. 
 - 23 p. :  ill. ;  25 cm. 
 - Notes on applied science ;  no. 23 .
<br/><br/> At head of title: National Physical Laboratory. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Photometry.
<br/><br/><label>Dewey Class. No.: </label>621