2 resultados para Lead contamination

em CUNY Academic Works


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Resumo:

Students are pictured with a professor around a workbench during a lead wiping class at the New York Trade School. Photograph is black and white.

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Resumo:

A lead wiping class at the New York Trade School is shown. Many students can be seen around workbenches. Black and white photograph that is damaged by scratches and is yellowing.