ISBNとともに宣伝されてるのがプロですね(目線が書店員)https://twitter.com/AkiyoshiKitaoka/status/1036157563908239360 …
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なるほど、専門書高いですもんね 個人的にはISBNが分かればすぐに予約とか書店員さんに聞いても在庫とか確認できるのでそのためかなと思ったので
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