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  1. pdfNLM Technical Bulletin, no.117-128 
    https://www.nlm.nih.gov/.../nlmarchives/techbull/117-128-1979.pdf
    ... REVIEW N3 219 442 800 N3 219 463 60 800 A method of examining and setting levels ... 69.169 D16.653.118.62 G2.403.60 D3.132.760.180 03.132.880.180 ... 173 D18.222.175.235 G5.148.166.£60 G5.832.260 010.516.627.315 DC6. ...