TY  - RPRT
TI  - Gage block flatness and parallelism measurement 
AU  - Beers, J S
AU  - Tucker, C D
PY  - 1973
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 73-239
DO  - 10.6028/NBS.IR.73-239
ER  -