TY  - BOOK
AU  - Snell , Faster Dee
AU  -  Snell, Cornelia T.
TI  - Colorimetric Methods of Analysis Including Photometric Methods ( Vol.4A AAA):  
U1  - 545.812  
PY  - 1971///.
CY  - New Jersey: 
PB  - Van Nostrand Reinhold Co ; 
ER  -