Stream water geochemistry from selected catchments on the Kola Peninsula (NW Russia)and in neighbouring areas of Finland and Norway: 1. Elements levels and sources - de Caritat, Patrice; Reimann, Clemens; Äyräs, Matti; Niskavaara, Heikki; Chekushin, Viktor A.; Pavlov, Vladimir A. (Aquatic Geochemistry, 1996)