TY  - RPRT
TI  - Chronic bronchitis in farmers.
AU  - E Melbostad
AU  - W Eduard
AU  - P Magnus
PY  - 1997
DO  - 10.5271/sjweh.220
UR  - https://pubmed.ncbi.nlm.nih.gov/9322818/
ID  - 9322818
ER  -