TY  - BOOK
AU  - Helrich,Kennet
TI  - Official  methods of analysis / Kennet Helrich
SN  - 0-935584-42-0
U1  - 543.08076 H762o 
CY  - USA :  association of official analytical chemists
KW  - 1.METHODS 2.ANALYSIS
N1  - Includes Subject index
ER  -