Best non-fiction books of the twentieth century

Here is a left-wing list. Here is a National Review list, with Hayek and Robert Conquest near the top. Here are two Random House lists. The critics elevate Henry Adams, William James, and Booker T. Washington. The readers favor Ayn Rand, L. Ron Hubbard, and John Lott. The readers' list has all kind of libertarian books, including David Boaz and Tibor Machan. Thanks to the ever-interesting www.politicaltheory.info for the link. All of the lists make for fun browsing, especially once you start thinking about the contrasts.