TY  - RPRT
TI  - Personal ear protection evaluation--present and future.
AU  - P L Michael
AU  - D F Bolka
PY  - 1971
DO  - 10.1080/0002889718506536
UR  - https://pubmed.ncbi.nlm.nih.gov/5137932/
ID  - 5137932
ER  -