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For the main study, mine-level and employee-level analyses are planned, which require adequate sample sizes of mines and of empl

ICR 200705-0920-009 · OMB 0920-0754 · Object 2957701.

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For the main study, mine-level and employee-level analyses are planned, which require adequate sample sizes of mines and of empl
Linda Jansen McWilliams
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2007-04-02
2026-09-14
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