deaths. A congressional hearing placed the death toll at 476, but a book published by epidemiologist Martin Cherniack, and as stated by the U.S. National Park Service, estimated the death toll to be 764, making it America's deadliest industrial disaster.

Asbestos mining and 'Calidria' brand fibers

In the early 1960s, Union Carbide Corporation began mining a newly identified outcrop of chrysotile asbestos fibers near King City and New Idria, California.

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