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Bill is involved with the following papers on occupational asthma. 
   
   |  | James AL, Cookson WOCM, Buters B, Lewis S, Ryan G, Hockey R, Musk AW, 
      Symptoms and longitudinal changes in lung function in young seasonal grain handlers,
      Brit J Industr Med,
      1986;43:587-591, |  |  
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