548,312 RIIHIMAKI HILKKA Back disorders in relation to heavy physical work : a comparative study of concrete reinforcement worker and house painters : academic dissertation / Hilkka Riihimaki ; from the Department of Epidemiology and Biostatistics Institute of Occupational Health, Helsinki and LEL Employment Pension Fund. - Helsinki : [T:mi P. Emanuelsson], 1990. - [8], 73, [54 wiele liczb.] s. : wykr. ; 25 cm Summ. ISBN 951-801-747-6