3. The American Spelling Book – 100 Million
By Noah Webster
First published in 1783, this book became the preferred textbook in all English schools throughout the 19th century in America. It was in 1783 that this famous book was first published. What was charming in this book was the idea of breaking the words into syllables making it easier for students trying to learn pronunciation. The fact that most students used this book made it to be bought in high numbers and since then about 100 million copies have been bought rendering this book one of the best selling books of all time.