All

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 I01 Social Sciences D012942 +
  I01.409 Government D006076 +
   I01.409.275 Government Agencies D006077 +
    I01.409.275.300 United States Dept. of Health and Human Services D014483 +
     I01.409.275.300.650 United States Public Health Service D014492 +
      I01.409.275.300.650.450 National Institutes of Health (U.S.) D009316 +
       I01.409.275.300.650.450.475 National Library of Medicine (U.S.) D009317 
 L01 Information Science D007254 +
  L01.346 Information Centers D007253 +
   L01.346.596 Libraries D007990 +
    L01.346.596.563 Libraries, Medical D007993 +
     L01.346.596.563.725 National Library of Medicine (U.S.) D009317 
 N03 Health Care Economics and Organizations D004472 +
  N03.540 Organizations D009938 +
   N03.540.427 Government Agencies D006077 +
    N03.540.427.300 United States Dept. of Health and Human Services D014483 +
     N03.540.427.300.650 United States Public Health Service D014492 +
      N03.540.427.300.650.450 National Institutes of Health (U.S.) D009316 +
       N03.540.427.300.650.450.475 National Library of Medicine (U.S.) D009317