title: Google Books API JSON and ISBN / VolumeID
body: <p>I have 3000+ books, some with ISBN numbers and some without. I am trying to get a their thumbnail images (possibly subtitle &amp; author) from a JSON file using Google API search queries.</p>
  
  <p>I have noticed that each search query produces different JSON files - is this normal? The VolumeID query seems to be return a more detailed JSON? I have included the relevant JSON files below.</p>
  
  <p>Setup = Win7, localhost, apache, php, chrome.</p>
  
  <p><strong>The isbn: query:</strong></p>
  
  <p><a href="https://www.googleapis.com/books/v1/volumes?q=isbn:0716604892" rel="nofollow">https://www.googleapis.com/books/v1/volumes?q=isbn:0716604892</a></p>
  
  <p>Which returns the following JSON;</p>
  
  <pre><code>{
   "kind": "books#volumes",
   "totalItems": 1,
   "items": [
    {
     "kind": "books#volume",
     "id": "beSP5CCpiGUC",
     "etag": "cNL3l6PTv24",
     "selfLink": "https://www.googleapis.com/books/v1/volumes/beSP5CCpiGUC",
     "volumeInfo": {
      "title": "The 1989 World Book year book",
      "subtitle": "a review of the events of 1988 ; the annual supplement to the World book encyclopedia",
      "authors": [
       "Robert O. Zeleny"
      ],
      "publishedDate": "1989-02-01",
      "industryIdentifiers": [
       {
        "type": "ISBN_10",
        "identifier": "0716604892"
       },
       {
        "type": "ISBN_13",
        "identifier": "9780716604891"
       }
      ],
      "readingModes": {
       "text": false,
       "image": false
      },
      "pageCount": 576,
      "printType": "BOOK",
      "categories": [
       "Reference"
      ],
      "contentVersion": "preview-1.0.0",
      "imageLinks": {
       "smallThumbnail": "http://bks8.books.google.co.uk/books?id=beSP5CCpiGUC&amp;printsec=frontcover&amp;img=1&amp;zoom=5&amp;source=gbs_api",
       "thumbnail": "http://bks8.books.google.co.uk/books?id=beSP5CCpiGUC&amp;printsec=frontcover&amp;img=1&amp;zoom=1&amp;source=gbs_api"
      },
      "language": "en",
      "previewLink": "http://books.google.co.uk/books?id=beSP5CCpiGUC&amp;dq=isbn:0716604892&amp;hl=&amp;cd=1&amp;source=gbs_api",
      "infoLink": "http://books.google.co.uk/books?id=beSP5CCpiGUC&amp;dq=isbn:0716604892&amp;hl=&amp;source=gbs_api",
      "canonicalVolumeLink": "http://books.google.co.uk/books/about/The_1989_World_Book_year_book.html?hl=&amp;id=beSP5CCpiGUC"
     },
     "saleInfo": {
      "country": "GB",
      "saleability": "NOT_FOR_SALE",
      "isEbook": false
     },
     "accessInfo": {
      "country": "GB",
      "viewability": "NO_PAGES",
      "embeddable": false,
      "publicDomain": false,
      "textToSpeechPermission": "ALLOWED",
      "epub": {
       "isAvailable": false
      },
      "pdf": {
       "isAvailable": false
      },
      "webReaderLink": "http://books.google.co.uk/books/reader?id=beSP5CCpiGUC&amp;hl=&amp;printsec=frontcover&amp;output=reader&amp;source=gbs_api",
      "accessViewStatus": "NONE",
      "quoteSharingAllowed": false
     }
    }
   ]
  }
  </code></pre>
  
  <p><strong>The volumeId query;</strong></p>
  
  <p><a href="https://www.googleapis.com/books/v1/volumes/beSP5CCpiGUC" rel="nofollow">https://www.googleapis.com/books/v1/volumes/beSP5CCpiGUC</a></p>
  
  <p>I get the following JSON;</p>
  
  <pre><code>{
   "kind": "books#volume",
   "id": "beSP5CCpiGUC",
   "etag": "Zx4P5cYhhLU",
   "selfLink": "https://www.googleapis.com/books/v1/volumes/beSP5CCpiGUC",
   "volumeInfo": {
    "title": "The 1989 World Book year book",
    "subtitle": "a review of the events of 1988 ; the annual supplement to the World book encyclopedia",
    "authors": [
     "Robert O. Zeleny"
    ],
    "publisher": "World Book",
    "publishedDate": "1989-02-01",
    "industryIdentifiers": [
     {
      "type": "ISBN_10",
      "identifier": "0716604892"
     },
     {
      "type": "ISBN_13",
      "identifier": "9780716604891"
     }
    ],
    "readingModes": {
     "text": false,
     "image": false
    },
    "pageCount": 576,
    "printedPageCount": 584,
    "dimensions": {
     "height": "26.00 cm"
    },
    "printType": "BOOK",
    "categories": [
     "Encyclopedias and dictionaries",
     "History",
     "Yearbooks",
     "Reference / Yearbooks &amp; Annuals"
    ],
    "contentVersion": "preview-1.0.0",
    "imageLinks": {
     "smallThumbnail": "http://bks8.books.google.co.uk/books?id=beSP5CCpiGUC&amp;printsec=frontcover&amp;img=1&amp;zoom=5&amp;imgtk=AFLRE736tSIRMcPp77lZYXBvTtzig6KA5oP0RmH9_4--kTDCuQzvlcknopkOZgyLzBFI_hPMd-6MJTcEO-VZZDFzeDCDkjdsiQ&amp;source=gbs_api",
     "thumbnail": "http://bks8.books.google.co.uk/books?id=beSP5CCpiGUC&amp;printsec=frontcover&amp;img=1&amp;zoom=1&amp;imgtk=AFLRE72NzXnCEhmuPOXXn9VNNBgc-uC37bUnfBkbN25dnVcmdSU8Y3E8rNQNCj7Im_YVWH2RXFeqdQ2tengtOsgCjSJh06Oypg&amp;source=gbs_api",
     "small": "http://bks8.books.google.co.uk/books?id=beSP5CCpiGUC&amp;printsec=frontcover&amp;img=1&amp;zoom=2&amp;imgtk=AFLRE73COelJADcztpk28bKnJ4GQP7Nn7ScPgUbyk90mt25jpcuoU-cDZD--gj9j3jwutTtkTu6bzVouAdjLxi-sy0AN35bD7A&amp;source=gbs_api",
     "medium": "http://bks8.books.google.co.uk/books?id=beSP5CCpiGUC&amp;printsec=frontcover&amp;img=1&amp;zoom=3&amp;imgtk=AFLRE73oXHyjFepDB-fitily_UF8UmnKZMrTes6ZVsa576_LNl5wczwkJmW6mv_4RK2_nExpPft8N72BXJ7WUzsGwDLCq-5rEw&amp;source=gbs_api",
     "large": "http://bks8.books.google.co.uk/books?id=beSP5CCpiGUC&amp;printsec=frontcover&amp;img=1&amp;zoom=4&amp;imgtk=AFLRE71psAjJeg1UFlkqIbh-5IiHVNYPmZW9bb9IQjps23zPD-TlXqQ6RGeVRUMPqYpSVWcYwY8zQnwNITxWLBqp_zgMzpMiYw&amp;source=gbs_api",
     "extraLarge": "http://bks8.books.google.co.uk/books?id=beSP5CCpiGUC&amp;printsec=frontcover&amp;img=1&amp;zoom=6&amp;imgtk=AFLRE70VKrBxxv8Q2Ltr3qhAwh3UMx3d3tv2r2bzwXvlu10_KpyA1TuM0_6RiIEkBe4ENHT21EH_xzPQBe7LWRBgU1IhozIoNQ&amp;source=gbs_api"
    },
    "language": "en",
    "previewLink": "http://books.google.co.uk/books?id=beSP5CCpiGUC&amp;hl=&amp;source=gbs_api",
    "infoLink": "http://books.google.co.uk/books?id=beSP5CCpiGUC&amp;hl=&amp;source=gbs_api",
    "canonicalVolumeLink": "http://books.google.co.uk/books/about/The_1989_World_Book_year_book.html?hl=&amp;id=beSP5CCpiGUC"
   },
   "saleInfo": {
    "country": "GB",
    "saleability": "NOT_FOR_SALE",
    "isEbook": false
   },
   "accessInfo": {
    "country": "GB",
    "viewability": "NO_PAGES",
    "embeddable": false,
    "publicDomain": false,
    "textToSpeechPermission": "ALLOWED",
    "epub": {
     "isAvailable": false
    },
    "pdf": {
     "isAvailable": false
    },
    "webReaderLink": "http://books.google.co.uk/books/reader?id=beSP5CCpiGUC&amp;hl=&amp;printsec=frontcover&amp;output=reader&amp;source=gbs_api",
    "accessViewStatus": "NONE",
    "quoteSharingAllowed": false
   }
  }
  </code></pre>
  
  <p>Any suggestions are welcome, If there is a better or more efficient way of retrieving thumbnails/info please let me know as this is a personal development project and I am willing to learn.</p>
  
  <p>I can provide my current code if necessary.</p>