00563nam a2200205Ia 4500 IN-BaIIA 211028s9999 xx 000 0 eng d 471-81300-1 IIA Library 621.383 SOM Sommer, A. H 3208 Photoemissive materials preparation, properties and uses A. H. Sommer New York Wiley 1968 ix, 256p. NASA thesaurus Photoelectric emission 2888 Photographic processing Photography BK 3353 3353 0 0 0 0 BAN BAN GEN 1969-12-24 93.24 0 621.383/ SOM 3728 2021-11-05 93.24 1969-12-24 BK Rs. 93.24