TY - RPRT TI - Selected tables of atomic spectra - A atomic energy levels-second edition, B multiplet tables : N IV, N V, N VI, N VII - data derived from the analyses of optical spectra AU - Moore, Charlotte E PY - 1971 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS NSRDS 3sec4 DO - 10.6028/NBS.NSRDS.3sec4 ER -