TY  - RPRT
TI  - Standard Reference Materials Film step tablet standards of diffuse visual transmission density - SRM 1001 and SRM 1008
AU  - O'Brian, Thomas R
AU  - Parr, Albert C
AU  - Early, Edward A
PY  - 1998
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - NIST SP 260-135
DO  - 10.6028/NIST.SP.260-135
ER  -