Use "full" projection to get additional volume identifiers/metadata from GB

[ryanfb]

See: https://developers.google.com/books/docs/v1/reference/volumes#resource

Projection
You can use the projection parameter with one of the following values to specify a predefined set of Volume fields to return:

full - Returns all Volume fields.
lite - Returns only certain fields. See field descriptions marked with double asterisks in the Volume reference to find out which fields are included.
The following example returns search results with limited volume information:

GET https://www.googleapis.com/books/v1/volumes?q=flowers&projection=lite&key=yourAPIKey

It looks like we've been getting "lite" by default, which apparently doesn't include these.

[ryanfb]

Actually not sure how much of a difference this will make. For LIM0AAAAMAAJ (from #14), here's the "full" output:

{
 "kind": "books#volume",
 "id": "LIM0AAAAMAAJ",
 "etag": "jYwIUXz8WS8",
 "selfLink": "https://www.googleapis.com/books/v1/volumes/LIM0AAAAMAAJ",
 "volumeInfo": {
  "title": "Translations and Poems Written on Several Subjects ...",
  "authors": [
   "Samuel Boyse"
  ],
  "publisher": "Mr. Thomas and Walter Ruddimans",
  "publishedDate": "1731",
  "readingModes": {
   "text": false,
   "image": true
  },
  "pageCount": 195,
  "printedPageCount": 224,
  "dimensions": {
   "height": "20.00 cm"
  },
  "printType": "BOOK",
  "maturityRating": "NOT_MATURE",
  "allowAnonLogging": false,
  "contentVersion": "1.1.1.0.full.1",
  "imageLinks": {
   "smallThumbnail": "http://books.google.com/books/content?id=LIM0AAAAMAAJ&printsec=frontcover&img=1&zoom=5&edge=curl&imgtk=AFLRE728_rhrIXBVMtENVW5ToJBeDrwBc9QST9Hdd7D2Sq-p-w91OeigGQFwFG2JjWnNgJ8VwGOuc-dbK_9rFKYVc2hfewS1HdjFGznBc6HZcnvv-k_DtApk7h7k4yz6BpAxGP5sD2D-&source=gbs_api",
   "thumbnail": "http://books.google.com/books/content?id=LIM0AAAAMAAJ&printsec=frontcover&img=1&zoom=1&edge=curl&imgtk=AFLRE73BXcolsOn_4GuJ5_wwjr9iylFEexFy3PZdYKWEZXze18sC4jjBb2qQ99PXhbySI5fjhrBLrZ3Bzg1sF-7WzwHNBJu5Liro6RYFOlYHbUs1oZibJBD9gCj7IoYZ4S_LHP6kkUUr&source=gbs_api",
   "small": "http://books.google.com/books/content?id=LIM0AAAAMAAJ&printsec=frontcover&img=1&zoom=2&edge=curl&imgtk=AFLRE72IzplTcDZTsAAXax88sYYtU4M1Fkqfd7Zkp68A6_GCvJ3mU0sRrkdAAZBVEOCSXc7MMn6n_i1E01EnL4KOJw2b2uW4vaFsX60hAjzx_KTKzUWP0en3PL9vXGNL6VY5KgjDPg3c&source=gbs_api",
   "medium": "http://books.google.com/books/content?id=LIM0AAAAMAAJ&printsec=frontcover&img=1&zoom=3&edge=curl&imgtk=AFLRE70R3KDrflxmAEqYcMUSWIxS5aVPe6nn4_MWyP3TmYaFpGDum0BJSlE8jhxXQiGTC6DMT9G3rEimcfHlj8fiRQL8RNjiNkS7ede3WeW5nrbpHaFSYf7dM3WkJVSkqahFvMyJoqJX&source=gbs_api",
   "large": "http://books.google.com/books/content?id=LIM0AAAAMAAJ&printsec=frontcover&img=1&zoom=4&edge=curl&imgtk=AFLRE73XuU_9EJV2DvUS1FZZAJ_ZbbahUmRU7iM5HheEH7HjJovUQK478a6-OaDbdrazsYlTJJkD-YQKCCwgZpgnbZUaMHsCAgcyVrv_0StYAffr0M5ko6LWHcJ6SlFwlNQJxDHFZ6RY&source=gbs_api",
   "extraLarge": "http://books.google.com/books/content?id=LIM0AAAAMAAJ&printsec=frontcover&img=1&zoom=6&edge=curl&imgtk=AFLRE71oMbtUzmnHnX6RSKXXN0NxYJRyw9Qxkv4MTlH1QEBbi2pl9VQ-4Q4gkkdnrZM4UkRXsRvG5ZHX510d8vDm4FsLIiNufKxcAet_il3HK3cZnre5HfFJ5U6ScCNmWp_QgrFQ6KqE&source=gbs_api"
  },
  "language": "en",
  "previewLink": "http://books.google.com/books?id=LIM0AAAAMAAJ&hl=&source=gbs_api",
  "infoLink": "https://play.google.com/store/books/details?id=LIM0AAAAMAAJ&source=gbs_api",
  "canonicalVolumeLink": "https://market.android.com/details?id=book-LIM0AAAAMAAJ"
 },
 "saleInfo": {
  "country": "US",
  "saleability": "FREE",
  "isEbook": true,
  "buyLink": "https://play.google.com/store/books/details?id=LIM0AAAAMAAJ&rdid=book-LIM0AAAAMAAJ&rdot=1&source=gbs_api"
 },
 "accessInfo": {
  "country": "US",
  "viewability": "ALL_PAGES",
  "embeddable": true,
  "publicDomain": true,
  "textToSpeechPermission": "ALLOWED",
  "epub": {
   "isAvailable": false,
   "downloadLink": "http://books.google.com/books/download/Translations_and_Poems_Written_on_Severa.epub?id=LIM0AAAAMAAJ&hl=&output=epub&source=gbs_api"
  },
  "pdf": {
   "isAvailable": true,
   "downloadLink": "http://books.google.com/books/download/Translations_and_Poems_Written_on_Severa.pdf?id=LIM0AAAAMAAJ&hl=&output=pdf&sig=ACfU3U1XsK5qxnVHGRU3rTr9ZXHXA2Ny7g&source=gbs_api"
  },
  "webReaderLink": "http://play.google.com/books/reader?id=LIM0AAAAMAAJ&hl=&printsec=frontcover&source=gbs_api",
  "accessViewStatus": "FULL_PUBLIC_DOMAIN",
  "quoteSharingAllowed": false
 }
}

And the "lite" output:

{
 "kind": "books#volume",
 "id": "LIM0AAAAMAAJ",
 "etag": "G3FrcUdVTYs",
 "selfLink": "https://www.googleapis.com/books/v1/volumes/LIM0AAAAMAAJ",
 "volumeInfo": {
  "title": "Translations and Poems Written on Several Subjects ...",
  "authors": [
   "Samuel Boyse"
  ],
  "publisher": "Mr. Thomas and Walter Ruddimans",
  "publishedDate": "1731",
  "readingModes": {
   "text": false,
   "image": true
  },
  "maturityRating": "NOT_MATURE",
  "allowAnonLogging": false,
  "contentVersion": "1.1.1.0.full.1",
  "imageLinks": {
   "smallThumbnail": "http://books.google.com/books/content?id=LIM0AAAAMAAJ&printsec=frontcover&img=1&zoom=5&edge=curl&imgtk=AFLRE70saIc5ZLqyf4KaAIE3vjR7mgPP-hnqPNlL1wJXLiGKWGttNYMfzGi3tOOOatF4PfxZCNHVFiYyDbCrmS8aoYnN4HsiOQejRiqBvYRUtAhS9gzjeoxLCq6PjRXmMIqKI8tyFDiT&source=gbs_api",
   "thumbnail": "http://books.google.com/books/content?id=LIM0AAAAMAAJ&printsec=frontcover&img=1&zoom=1&edge=curl&imgtk=AFLRE73GrCgEJajGw9dq7EL5Ym_rYnPsH5cxxIHTrZ38BzIhQLM0jMAR3wO1Lx6gleeBFMZ-dx_v8kH1oEYFdKXT7zBoOQKmQ0nYQPDjNpo8Id_GFGfgg6X0JN_OuEy-5Ng4fIuJMAcy&source=gbs_api",
   "small": "http://books.google.com/books/content?id=LIM0AAAAMAAJ&printsec=frontcover&img=1&zoom=2&edge=curl&imgtk=AFLRE72jbRDM9X5ZuIAlNYklJosHESakaKiCNwz2mGKd0vdlKI8IpTw7d-iGIlqzzjfS63620kywi0kSVsy4qiddOl2yUC2jLPCwUG5eafTk1j6QjSceFLcvLwih7lVn-ewgyb-pwKAb&source=gbs_api",
   "medium": "http://books.google.com/books/content?id=LIM0AAAAMAAJ&printsec=frontcover&img=1&zoom=3&edge=curl&imgtk=AFLRE72ahsQQAJOucDmlHtmvu4MyvpYACNToaU6NqFDfryRaPpjUosArcOI2uJPaMY5U4ebtEbxLh818JSuL_viL2M6J2e2e_z8ySNrLtrrIFC3_GL635BN75_HB36ji3HP-3qMM-9Wj&source=gbs_api",
   "large": "http://books.google.com/books/content?id=LIM0AAAAMAAJ&printsec=frontcover&img=1&zoom=4&edge=curl&imgtk=AFLRE73sB0KGlvBPpOLPSZL-QfSrlivAru8EZbh-J03Gg4jmKoGS1KE85E5eGTQO3i7p3F5DajdiRGcnDetsVqbYHtFTKiJaznLGZtDbetSWfgSqkLBghcapRZOOkAtkhQxSKtXE19nY&source=gbs_api",
   "extraLarge": "http://books.google.com/books/content?id=LIM0AAAAMAAJ&printsec=frontcover&img=1&zoom=6&edge=curl&imgtk=AFLRE71jKgSMun1Np8K2UrMw1XB2VeqfCrFTTNLvl0bdewy1MVeLxLJiGwMHMUkOex7R9587rsT2zo2NXQKd1YB5scU9Tid7eJG8d_y25QV0mZ01b46xEVH_FL5gDG_x6TwdUGYhd6L7&source=gbs_api"
  },
  "previewLink": "http://books.google.com/books?id=LIM0AAAAMAAJ&hl=&source=gbs_api",
  "infoLink": "https://play.google.com/store/books/details?id=LIM0AAAAMAAJ&source=gbs_api",
  "canonicalVolumeLink": "https://market.android.com/details?id=book-LIM0AAAAMAAJ"
 },
 "saleInfo": {
  "country": "US",
  "buyLink": "https://play.google.com/store/books/details?id=LIM0AAAAMAAJ&rdid=book-LIM0AAAAMAAJ&rdot=1&source=gbs_api"
 },
 "accessInfo": {
  "country": "US",
  "epub": {
   "isAvailable": false,
   "downloadLink": "http://books.google.com/books/download/Translations_and_Poems_Written_on_Severa.epub?id=LIM0AAAAMAAJ&hl=&output=epub&source=gbs_api"
  },
  "pdf": {
   "isAvailable": true,
   "downloadLink": "http://books.google.com/books/download/Translations_and_Poems_Written_on_Severa.pdf?id=LIM0AAAAMAAJ&hl=&output=pdf&sig=ACfU3U1XsK5qxnVHGRU3rTr9ZXHXA2Ny7g&source=gbs_api"
  },
  "accessViewStatus": "FULL_PUBLIC_DOMAIN"
 }
}

There's still no industryIdentifiers field with the OCLC number, which is the basis for the match from the HT->GB direction. Maybe this only matters for books with an ISBN.