child labor laws first passed
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child labor laws first passed
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when were the first child labor laws passed
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child labor laws first passed, when was the first child labor law passed, first child labor law passed, when were the first child labor laws passed, child labor laws started, child labor laws history, when were child labor laws introduced, what year did child labor laws start, when were child labor laws enacted, when were child labor laws created, when were child labor laws established