TY  - RPRT
TI  - Circular of the Bureau of Standards no. 177: United States government master specification for the construction of built-up roofing, type 5TCS
PY  - 1924
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CIRC 177
DO  - 10.6028/NBS.CIRC.177
ER  -