• unity

  EPSG:9201
  
  

• parts per million

  EPSG:9202
  
  

• coefficient

  EPSG:9203
  
  

• British foot (Sears 1922 truncated)

  EPSG:9300
  
  

• British chain (Sears 1922 truncated)

  EPSG:9301
  
  

• British link (Sears 1922 truncated)

  EPSG:9302
  
  

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