Filter Results Refine these results by: Category: History United States Native American General History Military North America Expeditions & Discoveries Europe World African American Social History Modern Women Maritime History & Piracy Middle East Revolutionary Russia & the Former Soviet Union Historiography Historical Geography Jewish Holocaust LGBTQ+ Study & Teaching Wars & Conflicts Americas Asia Caribbean & West Indies Latin America Africa Canada Oceania Reference Essays Civilization Medieval Ancient Polar Regions Australia & New Zealand Audio Length Less Than 1 Hour 1 to 3 Hours 3 to 6 Hours 6 to 10 Hours 10 to 20 Hours More than 20 Hours