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Business-sponsored teaching aids ; a report presenting the nature, purposes, and contentof freeand inexpensive materials for the, classroom ; now they are prepared, produced, and distributed ; their availability, actual use, and evaluation ; recommendations
- "Business-sponsored teaching aids ; a report presenting the nature, purposes, and contentof freeand inexpensive materials for the, classroom ; now they are prepared, produced, and distributed ; their availability, actual use, and evaluation ; recommendations"@en
- "Business-sponsored teaching aids : a report presenting the nature, purposes, and content of free and inexpensive materials for the classroom"@en