Columbia subject headings:
Footwear industry--Massachusetts.
Occupational diseases--Health aspects.
Harvard subject headings:
Boots--Trade and manufacture--Massachusetts.
Footwear industry--Dust control--Massachusetts.
Footwear industry--Employees--Health and hygiene--Massachusetts.
Footwear--Trade and manufacture--Massachusetts.
Industrial hygiene--Massachusetts.
Occupational diseases--Health aspects.
Shoes--Trade and manufacture--Massachusetts.
Princeton subject headings: