TY  - GEN
AU  - O'Brian, Thomas R
AU  - Parr, Albert C
AU  - Early, Edward A
C2  - , National Institute of Standards and Technology, Gaithersburg, MD
DA  - 1998-01-01 05:01:00
DO  - https://doi.org/10.6028/NIST.SP.260-135
LA  - en
PB  - , National Institute of Standards and Technology, Gaithersburg, MD
PY  - 1998
TI  - Standard Reference Materials:Film step tablet standards of diffuse visual transmission density - SRM 1001 and SRM 1008
ER  -