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2
-
Ability in Social and Racial Classes: Some Physiological Correlates / By Roland Clark Davis.
- 305.8
- Davies, Roland Clark.
- The Century,
- 1932.
- New York :
-
The Calculus / by Hans H.Dalaker and Henry E. Hartig.
- 515.15
- Dalaker, Hans H.
- McGraw-Hill Book,
- 1932.
- New York :