TY  - RPRT
TI  - Performance of roofing in Puerto Rico 
AU  - Cullen, William C
AU  - Walton, William W
PY  - 1962
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS report ; 7489
DO  - 10.6028/NBS.RPT.7489
ER  -