TY  - RPRT
TI  - Respirator usage and effectiveness in bituminous coal mining operations.
AU  - H E Harris
AU  - W C DeSieghardt
AU  - W A Burgess
AU  - P C Reist
PY  - 1974
DO  - 10.1080/0002889748507018
UR  - https://pubmed.ncbi.nlm.nih.gov/4522752/
ID  - 4522752
ER  -