TY  - RPRT
TI  - Pulmonary function differences in normal smoking and nonsmoking, middle-aged, white-collar workers.
AU  - R A Krumholz
AU  - E C Hedrick
PY  - 1971
UR  - https://pubmed.ncbi.nlm.nih.gov/5131838/
ID  - 5131838
ER  -