National standard reference data series, NSRDS-NBS. 35, v. 1. Atomic energy levels as derived from analyses of optical spectra: v. 1, Spectra of hydrogen, deuterium, tritium, helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, neon, sodium, magnesium, aluminum, silicon, phosphorus, sulfur, chlorine, argon, potassium, calcium, scandium, titanium, and vanadium; by Charlotte E. Moore.