{
  "id": "UN139",
  "name": "Acre based on US survey foot",
  "ml_name": "ip_Ac_{US}",
  "symbol": "Ac",
  "reference": "https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8#A"
}