International congress on the occasion of the thirtieth anniversary of the Associated Schools Project Sofia, Bulgaria, 12-16 September 1983
| מחבר תאגידי: | |
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| פורמט: | ספר |
| שפה: | English |
| יצא לאור: |
Paris
United Nations Educational, Scientific, and Cultural Organization
1984.
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| נושאים: |