TY  - RPRT
TI  - The application of x-ray projection microscopy to roofing asphalt systems 
AU  - Greenfeld, Sidney H
PY  - 1962
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS report ; 7589
DO  - 10.6028/NBS.RPT.7589
ER  -