These introductions have been written with a younger audience in mind. They may also suit older readers and similarly younger readers may find the general introductions suit them better.
Classic Introductions
In their day these were the books that introducced many Westerners to the game of Go. There a now better introductions for beginners, but these are of historical interest.
Books of Problems
Rather than just reading about the game, problems are a valuable aid to learning about Go. These books of problems are suitable to accompany any introductory book.