Sebastião Salgado's "Workers "is an elegy to the manual laborers of the industrial age in the fields of agriculture, mining, oil, construction, food and industry. Salgado's powerful images of tea pickers in Rwanda, dam builders in India, steelworkers in France and the Ukraine, sugarcane harvesters in Brazil, assembly-line workers in Russia and China, sulfur miners in Indonesia and others pay moving tribute to the working people who, in Salgado's portrayal, have maintained their dignity under the harshest of conditions. Made over a period of six years, the 250 photographs comprising the...