TY  - GEN
AU  - Burns, Velma I
C2  - , National Institute of Standards and Technology, Gaithersburg, MD
DA  - 1962-01-01 05:01:00
DO  - https://doi.org/10.6028/NBS.RPT.7704
LA  - en
PB  - , National Institute of Standards and Technology, Gaithersburg, MD
PY  - 1962
TI  - Standard filters for calibrating photographic exposure meters:
ER  -