Working papers on excitation and ionization of solar atoms. Includes: "Absorption coefficients in hydrogen and calcium" 14 February 1966; "Non-uniformity considerations in the photosphere"; "Interpenetrating streams" 19 December 1975; "Thermalization of hot electrons in a plasma"; "The relaxation time of a hot electron gas"; "The problem of fibrils in active regions"; "On the origins of the K₂ emission peaks"; Photocopy of paper "Inelastic collisions between heavy particles, etc." by D.R. Bates and G. Griffing

Working papers on excitation and ionization of solar atoms. Includes: Typescripts titled "The model atom" and "The equations of statistical equilibrium"; Working papers on excitation, n.d.

Working papers, reprint, and correspondence on excitation and ionization of solar atoms. Includes: Working papers "Excitation and emission of Ca II"; Reprint "Excitation of hydrogen and Ca II under chromospheric conditions"; Correspondence from L.W. Avery and A. Skumanich, 4 August 1969

Working papers on excitation and ionization of solar atoms. Includes: Working notes titled "Recombination in Ca+" and "Photoionization in Ca+"

Working papers on excitation and ionization of solar atoms. Includes: Draft manuscript "Physical structure of the chromosphere", n.d.

Working papers on excitation and ionization of solar atoms. Includes: Working notes titled "Excitation and ionization - Collisional", "P.E. ionization rate" 23 February 1965, "Spontaneous and structural recombination rates"

Working papers on excitation and ionization of solar atoms. Includes: Folder titled "Notes related to chromospheric excitation"; Working notes titled "P.E. recombination"; "H a emission"; "The observed intensity in H,K"; "Excitation rates in the external field in H and K"; "Absorption coefficients in hydrogen and calcium" 14 February 1966; "Hydrogen excitation and emission"

Working papers on excitation and ionization of solar atoms. Includes: Working notes titled "The Causes of the solar CaII, H and K lines"; "General sketch of theory of physical conditions in chromospheric structures"; "The structure of the solar chromosphere"

Working papers, draft manuscripts, and draft typescript on excitation and ionization of solar atoms. Includes draft manuscripts: "Temperatures and densities in structures of the quiet chromosphere"; "Excitation of and emission of radiation by hydrogen and CaII under chromospheric conditions"; Draft typescript titled "Excitation of and emission of radiation by hydrogen and CaII under chromospheric conditions"