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1Publicado 1941New York, N.Y. : Guardians of American Education, c1941.1 online resource (43 p.) : ill.Materias: “...Social sciences Study and teaching United States....”
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2Publicado 1941New York, N.Y. : Guardians of American Education, c1941.43 p. : ill. ; 23 cm.Materias: “...Social sciences Study and teaching United States....”