TY  - RPRT
TI  - Procedures used at the National Bureau of Standards to determine selected trace elements in biological and botanical materials 
AU  - Mavrodineanu, R
PY  - 1977
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS SP 492
DO  - 10.6028/NBS.SP.492
ER  -