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1Publicado 1969“…Association of Classroom Teachers National Education Association…”
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2por Farr, Roger C.“…Association of Classroom Teachers National Education Association…”
Publicado 1970
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3por Spitzer, Herbert F.“…Association of Classroom Teachers National Education Association…”
Publicado 1970
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4por Rothney, John W.M“…Association of Classroom Teachers National Education Association…”
Publicado 1972
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5por Koran, John J.“…Association of Classroom Teachers National Education Association…”
Publicado 1970
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