This sixth reader is for high level reading. One source found lexile reading level of 12th grade. McGuffey Readers were a series of graded primers, including grade levels 1-6, widely used as textbooks in American schools from the mid-19th century to the mid-20th century, and are still used today in some private schools and in homeschooling. While McGuffey compiled the first four readers (1836-1837 edition), the fifth and sixth were created by his brother Alexander during the 1840s. The series consisted of stories, poems, essays and speeches. The advanced Readers contained excerpts from the works of well-regarded English and American writers and politicians such as John Milton, Lord Byron and Daniel Webster. The revised Readers were compiled to meet the needs of national unity and the dream of an American melting pot for the world's oppressed masses.