TY  - RPRT
TI  - Assessment of photooxidation of flexible plastics roofing by a colorimetric method 
AU  - Martin, Keith G
PY  - 1965
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS report ; 8646
DO  - 10.6028/NBS.RPT.8646
ER  -