TY  - RPRT
TI  - Isotopic abundance ratios reported for reference samples stocked by the National Bureau of Standards 
AU  - Mohler, F L
PY  - 1960
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS TN 51
DO  - 10.6028/NBS.TN.51
ER  -