NNotes on ionization in the solar atmosphereNotes on ionization in the solar atmospherede Henry Norris RussellMateriasIonizationSolar SpectrumEdiciones (1)Notes on ionization in the solar atmosphere (1922)inglésMás obras de Henry Norris RussellThe HR diagramIIn memory of Henry Norris RussellIn memory of Henry Norris RussellAAstronomyAstronomy
PPhotographic determinations of the position of the moonPhotographic determinations of the position of the moon
