TY  - RPRT
TI  - Circular of the Bureau of Standards no. 285: United States government master specification for slate-surfaced asphalt prepared roofing and shingles
PY  - 1925
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CIRC 285
DO  - 10.6028/NBS.CIRC.285
ER  -