1. Adler, I. (1966). X-ray Emission Spectrography in Geology Elsevier Publishing Company, Amsterdam, 258 pp.
2. Ahren, L. H. (1950). Spectrochemical Analysis Addison-Wesley Press Inc, Cambridge, Mass., 269 pp.
3. Ahren, L. H. (1965). Distribution of the Elements in Our Planet McGraw-Hill Book Co., New York, 110 pp.
4. Allan, R. J. (1971). Lake sediment: a medium for regional geochemical exploration of the Canadian Shield, C.I.M. Bull
64 43–59.
5. Allan, R. J., Cameron, E. M. and Durham, C. C. (1973). Reconnaissance geochemistry using lake sediments on a 36 000 square mile area of the northwestern Canadian Shield, Geol. Surv. Canada Paper 72–50