TY  - RPRT
TI  - Properties of plastic films for use as waterproofing materials in underground heat distribution systems 
AU  - Roberts, A G
PY  - 1958
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS RPT 5967
DO  - 10.6028/NBS.RPT.5967
ER  -