tag:katalog.ub.uni-paderborn.de,2015:/local/sSuchergebnisse für ids = HT013803482Universitätsbibliothek Paderborntag:katalog.ub.uni-paderborn.de,2015:SearchEngine::Record/990012880410106463Activities for junior high school and middle school mathematics<div>Easterday, Kenneth E</div><div>1981-</div>