The value of the didactic principles of Herbart-Ziller-Stoy in view of their serviceableness for the instruction in secondary schools (National Herbart society. Supplement to the 3d Yearbook) by Otto Paul Martin Frick

The value of the didactic principles of Herbart-Ziller-Stoy in view of their serviceableness for the instruction in secondary schools (National Herbart society.  Supplement to the 3d Yearbook) by Otto Paul Martin Frick

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