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2
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Research methods in education : an introduction / William Wiersma.
- 370.72 W648 1969
- Wiersma, William.
- J. B. Lippincott,
- c1969.
- Philadelphia :
-
Introduction to probability theory and statistical inference / Harold J. Larson.
- 519 L3345 1969
- Larson, Harold J., 1934-
- John Wiley & Sons,
- c1969.
- New York :