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  1. 1

    Teaching of mathematics in secondary schools : comparative study.

    Paris : UNESCO, 1956
    Format: Conference Proceeding Book


  2. 2

    Modern languages at general secondary schools : research in comparative education.

    Geneva, 1964
    Format: Conference Proceeding Book


  3. 3

    Teaching of natural science in secondary schools : from information supplied by the Ministries of Education.

    Paris : UNESCO, 1952
    Format: Conference Proceeding Book