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62
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Ability testing in developing countries : a handbook of principles and techniques / Paul A. Schwarz, Robert E. Krug.
- Praeger,
- 1972.
- New York [etc.] :
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Ethnocentrism : theories of conflict, ethnic attitudes, and group behavior / Robert A. LeVine, Donald T. Campbell.
- Wiley,
- 1972.
- New York [etc.] :