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Definitively worth a look. No examples from my subject of study but it appears in the tables at the end. They do cite 1955 and 1961 as examples of successful coups. The first was a preventative legalist countercoup which successfully allowed the elected President to assume office, and the second a failed coup though politically the result was a draw. As it distinguishes military and political perpetrators, more cases than registered were by both political and military factions. The 1964 case is formally known as a "Civilian-military coup" and happened so swiftly through strong support among governors and Congress.