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Combating Terrorism Center (CTC) was founded in 2001 and provides access to a range of outstanding reports and products, based on declassified documents and other primary source research that are available for download.
Small Wars Journal offers access to the blog, journal, and professional reading lists posted by a range of practitioners, academicians, and subject matter experts.
From Marx to Mao website provides the full text of most of Mao’s writings on guerrilla warfare, as well as those of V. I. Lenin.
US Army Special Operations Command’s Assessing Revolutionary and Insurgent Strategies (ARIS) Studies website features several useful studies and reports, a number of which have been updated, such as its ‘Casebook on Insurgency and Revolutionary Warfare’, ‘Human Factors Considerations of Underground in Insurgencies’, as well as an irregular warfare bibliography.