Differences in metal areal distribution displayed by trend-surface analysis.
D000397:Air Pollution / Q000032:analysis*; D001272:Atmosphere; D002104:Cadmium / Q000032:analysis; D003201:Computers; D003300:Copper / Q000032:analysis; D007854:Lead / Q000032:analysis; D008274:Magnesium / Q000032:analysis; D008345:Manganese / Q000032:analysis; D008377:Maps as Topic; D008670:Metals / Q000032:analysis*; D013053:Spectrophotometry; D014481:United States; D015032:Zinc / Q000032:analysis
D008670:Metals; D002104:Cadmium; D007854:Lead; D008345:Manganese; D003300:Copper; D008274:Magnesium; D015032:Zinc