TY  - RPRT
TI  - The chemical changes occurring during the degradation of two coating asphalts 
AU  - Greenfeld, Sidney H
PY  - 1956
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS RPT 4861
DO  - 10.6028/NBS.RPT.4861
ER  -