TY  - RPRT
TI  - Screw-thread standards for federal services 1957. Part I: unified, American, American national, and national miniature threads 
PY  - 1957
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS HB 28supp1957pt1
DO  - 10.6028/NBS.HB.28supp1957pt1
ER  -