Steven M. Cohen writes "From Human Events Online
Human Events asked a panel of 15 conservative scholars and public policy leaders to help us compile a list of the Ten Most Harmful Books of the 19th and 20th Centuries. Each panelist nominated a number of titles and then voted on a ballot including all books nominated. A title received a score of 10 points for being listed No. 1 by one of our panelists, 9 points for being listed No. 2, etc. Appropriately, The Communist Manifesto, by Karl Marx and Friedrich Engels, earned the highest aggregate score and the No. 1 listing."
[... and you'll never guess what No. 2 was! -a.k.]