[Air pollution in Valladolid in the year 1976].
D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000032:analysis*; D012621:Seasons; D012906:Smoke / Q000032:analysis*; D013030:Spain; D013458:Sulfur Dioxide / Q000032:analysis*
D000393:Air Pollutants; D012906:Smoke; D013458:Sulfur Dioxide
Contaminación atmosférica en Valladolid en el año 1976.