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1by International Educational Seminar on the Teaching of History as a Means of Developing International Understanding, Sèvres, France, 1951, Perdew, Richard M.programme and meeting document bibliotecaUNESCO
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2by International Educational Seminar on the Teaching of History as a Means of Developing International Understanding, Sèvres, France, 1951, Perdew, Richard M.programme and meeting document bibliotecaUNESCO