Hello All,
 I was just satisfying my itch to know how many wiki articles are distinctly about books in all of the Wikipedias. The follow is all the infobox books in all the languages and the respective counts. If you add them all up, you get 85,230 . That means we have at most 85,230 articles about books in the entire wikiverse, the actual number is probably less because this double counts to Wikipedias which have articles for the same book.

[[wikipedia:en:Template:Infobox book]] 30953
[[wikipedia:it:Template:Libro]] 10978
[[wikipedia:fr:Modèle:Infobox Livre]] 7964
[[wikipedia:es:Plantilla:Ficha de libro]] 3578
[[wikipedia:sv:Mall:Bokfakta]] 3067
[[wikipedia:ja:Template:基礎情報 書籍]] 2871
[[wikipedia:pl:Szablon:Książka infobox]] 2774
[[wikipedia:pt:Predefinição:Info/Livro]] 2045
[[wikipedia:ru:Шаблон:Издание]] 1972
[[wikipedia:ms:Templat:Infobox buku]] 1916
[[wikipedia:nl:Sjabloon:Infobox boek]] 1896
[[wikipedia:zh:Template:Infobox Book]] 1280
[[wikipedia:fa:الگو:جعبه اطلاعات کتاب]] 1269
[[wikipedia:sl:Predloga:Infopolje Knjiga]] 973
[[wikipedia:he:תבנית:ספר]] 901
[[wikipedia:hu:Sablon:Könyv infobox]] 872
[[wikipedia:cs:Šablona:Infobox Kniha]] 842
[[wikipedia:ar:قالب:صندوق معلومات كتاب]] 781
[[wikipedia:uk:Шаблон:Видання]] 675
[[wikipedia:bg:Шаблон:Книга инфо]] 620
[[wikipedia:no:Mal:Infoboks bok]] 574
[[wikipedia:ro:Format:Carte]] 560
[[wikipedia:ml:ഫലകം:Infobox book]] 555
[[wikipedia:vi:Bản mẫu:Thông tin sách]] 479
[[wikipedia:gl:Modelo:Libro]] 421
[[wikipedia:ko:틀:책 정보]] 387
[[wikipedia:th:แม่แบบ:กล่องข้อมูล หนังสือ]] 332
[[wikipedia:eu:Txantiloi:Liburu infotaula]] 323
[[wikipedia:et:Mall:Raamatu info]] 277
[[wikipedia:hr:Predložak:Infookvir knjiga]] 276
[[wikipedia:sk:Šablóna:Infobox Kniha]] 258
[[wikipedia:mk:Шаблон:Инфокутија Книга]] 233
[[wikipedia:tr:Şablon:Kitap]] 223
[[wikipedia:sr:Шаблон:Кутијица за књигу]] 201
[[wikipedia:bs:Šablon:Infokutija knjiga]] 201
[[wikipedia:mr:साचा:माहितीचौकट पुस्तक]] 182
[[wikipedia:hi:साँचा:ज्ञानसन्दूक पुस्तक]] 177
[[wikipedia:az:Şablon:Kitab]] 166
[[wikipedia:bn:টেমপ্লেট:তথ্যছক বই]] 138
[[wikipedia:ca:Plantilla:Llibre]] 138
[[wikipedia:id:Templat:Infobox book]] 133
[[wikipedia:da:Skabelon:Infoboks bog]] 126
[[wikipedia:eo:Ŝablono:Informkesto libro]] 114
[[wikipedia:ku:Şablon:Infobox Pirtûk]] 80
[[wikipedia:ur:سانچہ:خانۂ معلومات کتاب]] 57
[[wikipedia:sq:Stampa:Infobox libër]] 50
[[wikipedia:cy:Nodyn:Gwybodlen llyfr]] 49
[[wikipedia:or:ଛାଞ୍ଚ:Infobox Book]] 48
[[wikipedia:be:Шаблон:Выданне]] 36
[[wikipedia:ky:Калып:Китеп]] 34
[[wikipedia:uz:Andoza:Kitob]] 28
[[wikipedia:oc:Modèl:Infobox Libre]] 28
[[wikipedia:lv:Veidne:Grāmatas infokaste v2]] 28
[[wikipedia:af:Sjabloon:Boek]] 21
[[wikipedia:nn:Mal:Infoboks bok]] 18
[[wikipedia:gv:Clowan:Kishtey fys lioar]] 9
[[wikipedia:hsb:Předłoha:Infokašćik kniha]] 5
[[wikipedia:tl:Padron:Infobox book]] 5
[[wikipedia:su:Citakan:Kotak info buku]] 5
[[wikipedia:ta:வார்ப்புரு:தகவல்பெட்டி புத்தகம்]] 4
[[wikipedia:ilo:Plantilia:Infobox libro]] 4
[[wikipedia:sco:Template:Infobox Beuk]] 2
[[wikipedia:sh:Šablon:Kutijica za knjigu]] 2
[[wikipedia:la:Formula:Capsa libri]] 2
[[wikipedia:te:మూస:సమాచారపెట్టె పుస్తకం/doc]] 2
[[wikipedia:mn:Загвар:Инфобокс ном/doc]] 2
[[wikipedia:kk:Үлгі:Басылым/doc]] 2
[[wikipedia:km:ទំព័រគំរូ:ប្រអប់ព័ត៌មាន សៀវភៅ/doc]] 2
[[wikipedia:ka:თარგი:ინფოდაფა წიგნი/ინფო]] 1
[[wikipedia:ckb:داڕێژە:Infobox book]] 1
[[wikipedia:ps:کينډۍ:د کتاب مالوماتبکس-1]] 1
[[wikipedia:jv:Cithakan:Kothakinfo buku]] 1
[[wikipedia:bjn:Citakan:Infobox Book]] 1
[[wikipedia:lmo:Mudel:Scheda del Liber]] 1
[[wikipedia:si:සැකිල්ල:Infobox book/doc]] 0