Chemical laboratory, book by Booker T. Washington
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The university laboratory.
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Soil analysis; The students are required to work out in the laboratory...
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Physical laboratory. - A black and white photo of a group of people in...
Picryl description: Public domain image from the Schomburg Center for Research in Black Culture in Harlem, free to use, no copyright restrictions image. The Schomburg Center for Research in Black Culture in Har... More