TY  - RPRT
TI  - Some fractional factorial arrangements for factors at two levels 
AU  - Clatworthy, W H
AU  - Connor, W S
AU  - Zelen, M
PY  - 1954
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS report ; 3481
DO  - 10.6028/NBS.RPT.3481
ER  -