American national standard N540 :
classification of radioactive self-luminous light sources /
American National Standards Institute Subcommittee N43-2.
|Corporate Author:||American National Standards Institute.|
Washington : U.S. Dept. of Commerce, National Bureau of Standards : for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1976.
Radioactive substances /
Phosphors > Phosphors / Standards.
"Approved February 21, 1975, American National Standards Institute.
vii, 7 p. ;
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