TY  - RPRT
TI  - Letter Circular 23: measurement of pitch diameter of screw thread gages
PY  - 1923
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 23r1923
DO  - 10.6028/NBS.LCIRC.23r1923
ER  -