Standard samples issued or in preparation by the National Bureau of Standards.
[Washington, D.C. : U.S. G.P.O., 1949.]
Chemistry, Analytic /
"Supersedes Supplement dated December 11, 1946."
"Issued January 1, 1949."
"Supplement to National Bureau of Standards Circular 398."
At head of title: United States Dept. of Commerce, National Bureau of Standards.
ii, 19 p. ;
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