The United States Academic Decathlon publishes a variety of study materials for the objective events, the profits from which support the program. The "Resource Guides" and the "Basic Guides" constitute the majority of the USAD corpus. An art reproduction booklet and music CD contain a particular year's relevant pieces and are issued separately from the "Resource Guides". Study guides are also published and contain detailed topical outlines for each objective subject. These outlines specifically indicate which topics will require independent research beyond the material included in the "Resource Guides". USAD also offered "Research Guides" until 2010, which outlined the basics of what students ought to research. However, in the 2010–2011 competition season, USAD announced that it would be eliminating independent research-based questions from the competitions.