TY  - RPRT
TI  - Circular of the Bureau of Standards no. 206: United States government master specification for calcified gypsum
PY  - 1925
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CIRC 206
DO  - 10.6028/NBS.CIRC.206
ER  -