It's hard and dirty work, and in the labor hierarchy of oil rigs, roustabouts are a notch below roughnecks.

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Roustabouts are the workers who assemble and repair oil and gas field equipment.

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Roustabouts' numbers have increased by almost a third, to 54, 200 from 41, 120 a year earlier, reflecting the boom in energy markets.

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There are a couple groups for whom rising oil prices haven't been all bad: roustabouts and service unit operators in the oil and gas industry.

FORBES: America's Top 20 Growing And Disappearing Jobs