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| osha oil and gas training | 1.42 | 1 | 4960 | 25 | 23 |
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| osha safety and health manual | 0.26 | 0.5 | 3254 | 29 | 14 |
| osha used oil storage regulations | 0.66 | 0.2 | 295 | 33 | 100 |
