International congress on the occasion of the thirtieth anniversary of the Associated Schools Project Sofia, Bulgaria, 12-16 September 1983
| निगमित लेखक: | |
|---|---|
| स्वरूप: | पुस्तक |
| भाषा: | English |
| प्रकाशित: |
Paris
United Nations Educational, Scientific, and Cultural Organization
1984.
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| विषय: |