TY - RPRT TI - Bibliography on the analyses of optical atomic spectra : section 3, 42Mo - 57La 72Hf - 89Ac AU - Moore, Charlotte E PY - 1969 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS SP 306-3 DO - 10.6028/NBS.SP.306-3 ER -