TY  - RPRT
TI  - Letter Circular 986: color charts: a descriptive list (supersedes Letter Circular 809)
PY  - 1950
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 986
DO  - 10.6028/NBS.LCIRC.986
ER  -