TY  - BOOK
AU  - Helrich, Kenneth
TI  - Official methods of analysis of the association of official analytical chemists
SN  - 0935584420
AV  - QD79.C4 Of4(B)  1990
PY  - 1990///
CY  - Virginia
PB  - Association of official analytical chemists, Inc.
N1  - Includes index
ER  -