I had a really horribly mean moment where I thought (before reading the list) that they meant the Harry Potter series when they said 7 books.
I mean, what about required reading in schools? When I went through my initial list of 101 German-language books, I counted 35 that I had read for school!
And that's only German-language literature, we read important English novels in those classes as well, and some others in German class ...