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An undated but quite recent paper comparing the French and British models of U3A.
The U3A movement began in France in the 1970s. This paper dated September 1995 presents the two models, French and British, then summarises U3As in 20 or so countries on all continents.
This is a free internet service so it is not a membership organisation like most U3As are. It offers ideas, resources, and links for U3A contacts around the world.