TY  - RPRT
TI  - Guidelines for selection of and use of foam polyurethane roofing systems 
AU  - Cullen, William C
PY  - 1972
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS RPT 10963
DO  - 10.6028/NBS.RPT.10963
ER  -