Talk:Progressive massive fibrosis

I have re-written the article from my own knowledge, without following my text book anywhere nearly as closely. Sorry for the inconveniance.

Incidence
The source I used for increased incidence in central Appalachia suggests increased surface mining producing more silica dust might be responsible. Also increased sorting of coal and stone. I don't think this is definite enough to include in the article however. User:Fred Bauder Talk 09:20, 22 August 2018 (UTC)