"yardage books" meaning in English

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  "lang_code": "en",
  "pos": "noun",
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      "examples": [
        {
          "ref": "2008, John Feinstein, Caddy for Life: The Bruce Edwards Story, Little; Brown, →ISBN:",
          "text": "I noticed Bruce looking at two yardage books, one bright and brand-new, the other beaten up.",
          "type": "quote"
        }
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      "form_of": [
        {
          "word": "yardage book"
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      "glosses": [
        "plural of yardage book"
      ],
      "id": "en-yardage_books-en-noun-BV5mArC4",
      "links": [
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          "yardage book#English"
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  "sounds": [
    {
      "ipa": "/ˈjɑːdɪdʒ ˌbʊks/",
      "tags": [
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  ],
  "word": "yardage books"
}

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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      "examples": [
        {
          "ref": "2008, John Feinstein, Caddy for Life: The Bruce Edwards Story, Little; Brown, →ISBN:",
          "text": "I noticed Bruce looking at two yardage books, one bright and brand-new, the other beaten up.",
          "type": "quote"
        }
      ],
      "form_of": [
        {
          "word": "yardage book"
        }
      ],
      "glosses": [
        "plural of yardage book"
      ],
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          "yardage book#English"
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  "word": "yardage books"
}