00447nam a2200145Ia 4500 20251229184636.0 251229s9999 xx 000 0 und d Lession planning LB 1134 .D3 Davis, Robert H. Learning system design an approach to the improvement of instruction Robert H Davis New York McGraw-Hill Book Co. 1974 Learning Psychology Of BK 529466 529466 0 0 0 0 EGERTONLIB EGERTONLIB GEN 2025-12-29 0 LB 1134 D3 EU070515 2025-12-29 18:46:36 2025-12-29 BK