"Black-lung" disease Doctor blames cigarettes for 98% of lung damage; miners comments on relief program. RMN Jy 11, 1977 p.6,19 U.S. Labor Dept. opens black lung office in Denver. RMN Ja 24, 1979 p.52 U.S. Steel demands repayment of pension from black lung benefits of mine foreman. RMN Je 9, 1983 p.1,22 0
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