546,828 JORGENSEN HAROLD SIHM Medical and hygienic health problems in an iron ore mine with special reference to respiratory illness: [thesis] by Harold Sihm Jorgensen ; Umea University. - Umea : University, 1986?. - 117 s. wiele liczb. : il., wykr. ; 24,,cm + Abstract 2s. (Arbete och Halsa / Umea University, ISSN 0346-7821 ; 22) ; (Umea University Medtial Dissertations New Series, ISSN 0346-6612 ; No 170) ISBN 91-7464-308-8