Excerpt from Atomic Energy Levels, Vol. 1: As Derived From the Analyses of Optical Spectra; The Spectra of Hydrogen, Deuterium, Tritium, Helium, Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, Fluorine, Neon, Sodium, Magnesium, Aluminum, Silicon, Phosphorus, Sulfur, Chlorine, Argon The present volume is the first of a series being prepared at the National Bureau of Standards as part of a general program on atomic energy levels derived...