TY  - RPRT
TI  - Letter Circular 23 (Communication B523): measurement of pitch diameter of screw thread gages
PY  - 1922
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 23
DO  - 10.6028/NBS.LCIRC.23
ER  -