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Regional geochemical mapping in the tropical environment: bedrock reflection of Precambrian volcanosedimentary sequences in
B-horizon soil strata: case studies from Nigeria/West Africa
; Matheis, G; Utke, A; in, GEOANALYSIS 90, an international
symposium on the analysis of geological materials
; Hall, G E M (ed.). Geological Survey of Canada, Bulletin 451, 1993 p.