TY  - RPRT
TI  - Circular of the Bureau of Standards no. 38 4th edition: the testing of rubber goods
PY  - 1921
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CIRC 38e4
DO  - 10.6028/NBS.CIRC.38e4
ER  -