TY  - BOOK
AU  - Loya,Ernest W.
AU  - Seitz,Charles A.
AU  - Emerson,David E.
TI  - Gravimetric preparation of primary standard gas mixtures in the parts per trillion range
T2  - Report of investigations / United States Department of The Interior, Bureau of Mines
U1  - 622 s 
PY  - 1982///
CY  - [Avondale, Md.]
PB  - U.S. Dept. of the Interior, Bureau of Mines
KW  - Helium
KW  - Analysis
KW  - Chemistry, Analytic
KW  - Quantitative
ER  -