TY  - RPRT
TI  - Photographic dosimetry at total exposure levels below 20 mr 
AU  - Ehrlich, M
PY  - 1959
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS TN 29
DO  - 10.6028/NBS.TN.29
ER  -