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G- Fig, 12 - Long-fibor aebootoa inhalation oxpori nrant. Guinea pig with 0 months' dust cxposuro. The bronchiole, at center, already nhcr.va en accumulation of phagocjrtio oolla, with alight oollagon depo sition. Comparo with fig, 10, ohowing tho reaction to ball-milled anbeito3 after 2'1 montha. (200 X.) i & \ rw'