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1Publicado 1968### CRL customization ### ?> ### Add publisher and desc details ### ?>Pittsburgh, 1968.17 p. ; 28 cm.Materias: “...Social sciences Study and teaching (Secondary) Textbooks....”
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2Publicado 1968### CRL customization ### ?> ### Add publisher and desc details ### ?>[New York : Joint Council on Economic Education, 1968]25 p. ; 28 cm.Materias: “...Social sciences Study and teaching (Secondary) Textbooks....”