| Miners putting up a wooden pit prop in an underground coal mine, England, 1950s | 24 | | | | |
| Miners putting up a wooden pit prop in an underground coal mine, England, 1950s | 1 | | | | |
| Workers with striped shirts used to identify the group that found a gold lode in a given lot, Serra Pelada Gold Mine, Brazil, 1986 | 1 | | | | |
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