Research studies in commercial education : Reports of investigations as presented at the Iowa research conference on commercial education in March, 1927
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書誌事項
Research studies in commercial education : Reports of investigations as presented at the Iowa research conference on commercial education in March, 1927
（University of Iowa, monographs in education / Charles L. Robbins, editor, 1 series,
The College of education and the College of commerce, University of Iowa, 1928-
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