OPINION
ROGERS, Circuit Judge.
A totally disabled coal miner with Chronic Obstructive Pulmonary Disease (COPD) (and certain other lung diseases not relevant here) must meet two independent causation requirements in order to receive federally-mandated black lung benefits. One relates to causation of the disease by coal mining; the other relates to causation of the total disability by the disease. Under the applicable regulation, the COPD must first "aris...
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