TY  - RPRT
TI  - Letter Circular 857: terminology and symbols for use in ultraviolet, visible, and infrared absorptiometry
PY  - 1947
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 857
DO  - 10.6028/NBS.LCIRC.857
ER  -