Principles of Federal Appropriations Law: Annual Update of the Third Edition, GAO-08-450SP, March 13, 2008. (116 pages, PDF): “We are pleased to present the annual update of the third edition of Volumes I and II of Principles of Federal Appropriations Law. Our objective in this publication is to present a cumulative supplement to the published third edition text that includes all relevant decisions from January 1 to December 31, 2007. After Volume III is published, the third edition of Principles will be complete and all three volumes will be updated annually.”