TY  - RPRT
TI  - Letter Circular 607: the certification plan, its significance, scope and application to selected Federal specifications and commercial standards (superseding Letter Circular 559)
PY  - 1940
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 607
DO  - 10.6028/NBS.LCIRC.607
ER  -