TY  - RPRT
TI  - Chronic bronchitis in rural population.
AU  - S N Bhattacharyya
AU  - J K Bhatnagar
AU  - S Kumar
AU  - P C Jain
PY  - 1975
UR  - https://pubmed.ncbi.nlm.nih.gov/1205541/
ID  - 1205541
ER  -