Systems of Violence: The Political Economy of War and Peace in Colombia (Suny Series in Global Politics) or
Drugs, Oil, and War: The United States in Afghanistan, Colombia, and Indochina.
Or The Expediency of Culture: Uses of Culture in the Global Era
|To End a War||Holbrooke, Richard|
The last two just because they look really interesting, not because they have to do with Colombia, and the author of the last one is Obama's new something-something over the Middle East (I'm so informed--but hey that book was already on my to-read list and then I heard his name on NPR and recognized it).
Anyway, that's my two cents.