{
  "name": "Roman legion grain: the conversion, step by step",
  "desc": "Polybius's grain rations converted step by step from Attic medimni a month to kilograms a man and tonnes a legion a day; every row gives its source, and converted rows give the formula.",
  "lic": "CC BY 4.0",
  "lic_url": "https://creativecommons.org/licenses/by/4.0/",
  "by": "Treaties & Tradeoffs",
  "url": "https://treatiesandtradeoffs.com/logistics/roman-legion/",
  "from": [
    "Polybius, Histories 3.107, 6.20 and 6.39, trans. E. S. Shuckburgh (1889)",
    "William Smith, A Smaller Dictionary of Greek and Roman Antiquities, 12th ed. (1884), Table IX",
    "Weights and Measures Act 1985 (UK), Schedule 1",
    "USDA ERS, Agricultural Handbook No. 697 (1992)"
  ],
  "how": "Compiled by Treaties & Tradeoffs from the data listed",
  "data_by": [
    "Polybius, Histories 3.107, 6.20 and 6.39, trans. E. S. Shuckburgh (1889), Project Gutenberg eBook #44125, accessed 2026-11-02, public domain",
    "William Smith, A Smaller Dictionary of Greek and Roman Antiquities, 12th ed. (1884), Project Gutenberg eBook #65909, accessed 2026-11-02, public domain",
    "Weights and Measures Act 1985 (UK), Schedule 1, accessed 2026-11-02 (one defined constant)",
    "USDA ERS, Agricultural Handbook No. 697 (1992), accessed 2026-11-02, U.S. government work"
  ]
}