6. The McGuffey Readers – 60 Million
By William Holmes McGuffey
This anthology became so popular immediately it was published in 1836 and since then numerous editions of it have been printed. Most of the stories in this anthology have great deal of morals and a rich source of valuable teachings. About 80% of American schoolchildren used this book during the onset of the 19th century. According to different sources, this book was bought by millions of people in America and since then it has been considered to be one of the best selling books of all time.