Matches in Library of Congress for { ?s ?p Includes simple games, puzzles, and experiments which demonstrate basic scientific principles.. }
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- 78020897 abstract "Includes simple games, puzzles, and experiments which demonstrate basic scientific principles.".
- 84040786 abstract "Includes simple games, puzzles, and experiments which demonstrate basic scientific principles.".
- 78020897 description "Includes simple games, puzzles, and experiments which demonstrate basic scientific principles.".
- 84040786 description "Includes simple games, puzzles, and experiments which demonstrate basic scientific principles.".