Simplify the following text for a Grade 6 native English-speaking person.
Original: The library also houses a collection of more than 8,000 books donated by Marcus , including 1,100 miniature books , many from the press he founded .
Simplified: Mr. Marcus also gave the library a collection of more than 5,000 miniature books . ( Miniature books are very small books , small enough for a doll . )