TY  - RPRT
TI  - Letter Circular 15 (Communication B512): interchangeability of U.S. standards and British standard Whitworth threads by diameter modification
PY  - 1919
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 15
DO  - 10.6028/NBS.LCIRC.15
ER  -