TY  - RPRT
TI  - Letter Circular 992: list of National Bureau of Standards publications on photography (supersedes Letter Circular 531)
PY  - 1950
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 992
DO  - 10.6028/NBS.LCIRC.992
ER  -