TY  - RPRT
TI  - A proposed atlas of photographic negative emulsions 
AU  - Davis, Raymond
AU  - Walters, Jr., F. M.
PY  - 1920
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - NBS PC 1
DO  - 10.6028/NBS.PC.1
ER  -