UPDATE: More information found: “Young oyster shuckers, Josie, six years old, Bertha, six years old, Sophie, ten years old, Port Royal, South Carolina, 1912. Work began at 4:00 a.m.” ~source
More on this topic of what amounts to child slavery: The faces of lost youth: Haunting photos of child oyster shuckers show inhospitable working conditions borne by thousands of children before revolutionary labour laws were passed
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