TY  - RPRT
TI  - Bibliography on atomic energy levels and spectra, July 1971 through June 1975 
AU  - Hagan, Lucy
PY  - 1977
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS SP 363supp1
DO  - 10.6028/NBS.SP.363supp1
ER  -