10th International Geochemical Exploration Symposium, 3rd Symposium on Methods of Geochemical Prospecting : 10th IGES--3rd SMGP : Espoo/Helsinki, Finland, August 29 to September 2, 1983 : [abstracts] / organized and conducted by the Geological Surveys of Finland ... [and others ; edited by A. Björklund and T. Koljonen].