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3
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El Salvador / comp. Ralph Lee Woodward.
- Clio,
- cop. 1988.
- Oxford [etc.] :
-
Guatemala / comp. Ralph Lee Woodward.
- Clio,
- 1992.
- Oxford [etc.] :
-
Educational performance of the poor : lessons from rural Northeast Brazil / Ralph W. Harbison, Eric A. Hanushek.
- Oxford University Press,
- 1992.
- Oxford [etc.] :