TY  - RPRT
TI  - Circular of the Bureau of Standards no. 25 2nd edition: standard analyzed samples- general information
PY  - 1911
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CIRC 25e2
DO  - 10.6028/NBS.CIRC.25e2
ER  -