TY  - RPRT
TI  - Roof maintenance manual 
AU  - Snoke, H R
AU  - Cullen, W C
PY  - 1955
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS RPT 3994
DO  - 10.6028/NBS.RPT.3994
ER  -