Causes of the Cold War
Best of the Web
Yale Avalon Project—Cold War Documents: A collection of documents organized in categories of events and then in chronological order so you can piece together what unfolds.
Documents Related to the Cold War: A well-organized list, hosted by Mt. Holyoke College, of links and documents relating to the Cold War, organized chronologically.
Cold War International History Project at the Wilson Center: A large archive of documents with an international focus.