From the LA Times’ Jacket Copy blog:
The list includes poetry, novels, nonfiction, plays, a polemic, books of science and grammar, cookbooks and children's books. The list includes 26 books published since 1950, 35 published from 1900 to 1950, 15 published from 1850 to 1900, six published from 1800 to 1850 and nine published before 1800.If you want the list in nice tabular form, the Library of Congress website provides it.