Grindstones and grindstone makers one hundred years of grindstone making.
D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D008017:Life Expectancy / Q000266:history; D008297:Male; D008824:Michigan; D009790:Occupations / Q000266:history*; D011009:Pneumoconiosis / Q000209:etiology; D012829:Silicosis / Q000209:etiology; D014481:United States