TY  - RPRT
TI  - Bibliography on atomic energy levels and spectra, July 1968 through June 1971 
AU  - Hagan, Lucy
AU  - Martin, W C
PY  - 1972
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS SP 363
DO  - 10.6028/NBS.SP.363
ER  -