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Presents instructions for speaking thirteen secret languages, including Pig Latin, one of the best known and easiest codes to learn, and Boontling, developed by people in a California town.
- ISBN: 9780571121052
- Author: Schwartz, Alvin
- Illustrator: Zemach, Margot
- Published: 1989 , Farrar Straus & Giroux (J)
- Themes: languages, words
- Descriptors: Information Book, Intermediate (ages 9-14), International
- No. of pages: 82