TY  - RPRT
TI  - Circular of the Bureau of Standards no. 161: United States government specification for asphalt-saturated rag felt for roofing and waterproofing
PY  - 1924
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CIRC 161
DO  - 10.6028/NBS.CIRC.161
ER  -