1. Quantitative spectrochemical examination of minor constituents in Pollucite;Ahrens;Amer. Min.,1945
2. Analyses of minor constituents of Pollucite;Ahrens;Amer. Min.,1947
3. The use of ionization potentials. Part I. Ionic radii of the elements;Ahrens;Geochim. et Cosmochim. Acta,1952
4. The use of ionization potentials. Part II. Anion affinity and geochemistry;Ahrens;Geochim. et Cosmochim. Acta,1953
5. Quantitative Spectrochemical Analysis of Silicates;Ahrens,1954