Ear plugs: a field guide.
Sokol
Bill
B
Bacou-Dalloz Hearing Safety Group, Smithfield, RI, USA.
D004430:Ear Protective Devices / Q000145:classification*; D004867:Equipment Design; D006317:Hearing Loss, Noise-Induced / Q000517:prevention & control*; D006801:Humans; D009623:Noise, Occupational