TY  - RPRT
TI  - The National Measurement System for mass, volume and density 
AU  - Pontius, Paul E
AU  - Whetstone, James R
AU  - Simpson, John A
PY  - 1978
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 75-928
DO  - 10.6028/NBS.IR.75-928
ER  -