TY  - RPRT
TI  - Properties of 21 year old coal-tar pitch roofing membranes : a comparison with the NBS preliminary performance criteria
AU  - Mathey, Robert G
AU  - Rossiter, Walter J
PY  - 1977
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 77-1256
DO  - 10.6028/NBS.IR.77-1256
ER  -