TY  - RPRT
TI  - Emphysema in coalworkers.
AU  - W R Parkes
AU  - R G Williamson
AU  - T J Phillips
PY  - 1970
DO  - 10.1136/bmj.4.5732.430-c
UR  - https://pubmed.ncbi.nlm.nih.gov/5481525/
ID  - 5481525
ER  -