This is the 5804th most frequent German word.
bucher
"Bücher" means "books" in English.
Here, 'Bücher' is the plural form of the noun 'Buch,' referring to multiple physical books.
Ich lese gerne Bücher, besonders Romane.
I like reading books, especially novels.
In this sentence, 'Büchern' is the dative plural form of 'Buch,' used because of the dative context introduced by 'an'.
Die Bibliothek hat eine große Auswahl an Büchern.
The library has a wide selection of books.
Here, 'Büchern' is again in the dative plural form, required due to the prepositional phrase 'mit neuen Büchern.'