A new book entry has been added:
[drupal=146]Civ4 Reference Charts (BtS)[/drupal]
[drupal=146]Civ4 Reference Charts (BtS)[/drupal]
There are many reference charts available for download, with two of the most notable being this 76 page PDF version and this XLS version. Both include information on civilizations, units, buildings, wonders, and more -- updated for Beyond the Sword version 3.13!