1. The visibility and audibility of trains approaching rail-highway grade crossings;Aurelius;Rep. FRA-RP-71-2, Fed. Railroad Admin.,1971
2. Individual hearing protection and accident hazard;Christ;Die Berufsgenossenschaft,1976
3. A microcomputer based facility for psychoacoustic experimentation;Halford,1980
4. Discussion Document ‘Audiometry in Industry’;Health and Safety Executive,1978
5. Aspects of noise generation and hearing protection in underground coal mines;Michael;U.S. Bur. of Mines Final Rep. Grant No. G0122004,1972