TY  - RPRT
TI  - Design of free-air ionization chambers 
AU  - Wyckoff, H O
AU  - Attix, F H
PY  - 1957
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS HB 64
DO  - 10.6028/NBS.HB.64
ER  -