1. An asterisk indicates that the reference has been seen in abstract only.
2. The spectrochemical determination of fluorine in phosphate rocks;Ahrens;J. S. Afr. Chem. Inst.,1942
3. The spectrochemical determination of iron in glass sands;Ahrens;J. S. Afr. Chem. Inst.,1944
4. The trace element content of some important soils-a comparison;Allison;Proc. Soil Sci. Soc. Florida,1940
5. Determination of metals in some pectinates. Comparison of photometric and spectrographic methods;Ambler;Industr. Engng Chem. (Anal, ed.),1941