They've also included a map featuring the word for 'book' in the native language of each country.
Here's a list of the books included for each country:
Kevade by Oskar Luts for Esthonia
Harry Potter and the Philosopher's Stone for Great Britain
Pippi Longstocking by Astrid Lindgren for Sweden
Le Avventure di Pinocchio by Carlo Collodi for Italy
Le Petit Prince by Antoine de Saint-Exupéry for France
The Never-Ending Story by Ende for Germany
Heidi by Spyri for Switzerland
Orlovi Rano Lete by Branco Copic for Serbia
Toreadors from Vasyukivka by Nestayko for Ukraine
The Adventures of Tin Tin by Hergé for Belgium
Fada Oriana by Sophia de Mello Breyner Andresen for Portugal
Platero y yo by Jiménez for Spain
Mangas by Penelope Delta for Greece
Kake Make by Lina Zutaute for Lithuania
The Tale of Tsar Saltan by Alexander Sergeevich Pushkin for Russia
Tüskevár by István Fekete for Hungary
Amintiri din Copilarie by Ion Creanga for Romania
Cufoja dhe Bubi Kacurrel by Gaqo Bushaka for Albania
Pabbi Professor by Gunnar Helgason for Iceland
Jip en Janneke by Anne MG Shmidt for the Netherlands
The Moonmins by Tove Jansson for Finland
Akademia Pana Kleska by Jan Brzechwa for Poland
Slovenské Rozprávky by Pavol Dobšinský for Slovakia
Artemis Fowl and the Time Paradox by Eoin Colfer for Ireland
Den grimme ælling by Andersen for Denmark
Mrs Pepperpot Stories by Alf Prøysen for Norway
Čudnovate zgode šegrta Hlapića by Ivana Brlić Mažuranić for Croatia
Geschichten vom Franz by Christine Nöstlinger for Austria
source: https://www.bookstr.com/childrens-literature-map-shows-best-kids-books-europe