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| Written by | J.M. Parramón Homs and Eduard José |
| Illustrator | María Gracia |
| Published | 1985 |
| Publisher | Parramón |
| ISBN | 8434203464 |
Las mentiras de Koko (Grover's Lies) is a 1985 Barrio Sésamo storybook featuring Grover.
"Koko" is an unusual spelling of Grover's Spanish name; he's usually known as Coco.