TY  - RPRT
TI  - Radiological irregular opacities and coalwork exposure: a case-referent study.
AU  - A Cockcroft
AU  - N Andersson
PY  - 1987
DO  - 10.1136/oem.44.7.484
UR  - https://pubmed.ncbi.nlm.nih.gov/3620373/
ID  - 3620373
ER  -