TY  - RPRT
TI  - Letter Circular 11 (Communication B461): symbols for screw threat notation and formulas
PY  - 1919
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 11r1919
DO  - 10.6028/NBS.LCIRC.11r1919
ER  -