11.
Men and a woman looking at a machine with a light attached to it
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- Date:
- unknown
- Format:
- Still image
- Access:
- Public
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11.
12.
Men and women working in a factory
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- Date:
- unknown
- Format:
- Still image
- Access:
- Public
13.
Men working in a factory
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- Date:
- unknown
- Format:
- Still image
- Access:
- Public
14.
Men working on machinery in a mine
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- Date:
- unknown
- Format:
- Still image
- Access:
- Public
15.
Thirteen African American men, all wearing hats, with two motor testing machines, at the Midwest Trade School
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- Date:
- unknown
- Format:
- Still image
- Access:
- Public