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![Cover for Marshall J. Farr · The Long-Term Retention of Knowledge and Skills: A Cognitive and Instructional Perspective - Recent Research in Psychology (Paperback Book) [1987 edition] (1987)](https://imusic.b-cdn.net/images/item/original/314/9780387965314.jpg?marshall-j-farr-1987-the-long-term-retention-of-knowledge-and-skills-a-cognitive-and-instructional-perspective-recent-research-in-psychology-paperback-book&class=scaled&v=1409647468)