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 H01 Natural Sciences D010811 +
  H01.671 Physics D010825 +
   H01.671.768 Radiation D011827 +
    H01.671.768.638 Radiation, Nonionizing D011840 +
      H01.671.768.638.508 Infrared Rays D007259 
      H01.671.768.638.548 Lasers D007834 
      H01.671.768.638.552 Light D008027 
      H01.671.768.638.605 Microwaves D008872 
      H01.671.768.638.721 Radio Waves D011846 
      H01.671.768.638.943 Ultraviolet Rays D014466 
      H01.671.768.638.400 High-Energy Shock Waves D019220