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Digging into Language ReferencesDe Villiers, Peter A. and Jill G. (1979). Early Language. Cambridge, MA: Harvard University Press. Mallery, Garrick. (1972). Sign Language Among North American Indians. The Hague: Mouton. Riekehof, Lottie, L. (1987). The Joy of Signing, Second Edition. Springfield, MO: Gospel Publishing House. Tomkins, William. (1969). Indian Sign Language. New York, Dover Publications, Inc. The World Book Encyclopedia. 1989. Chicago: World Book, Inc. Takla Makan Mummies | Mummies 101 | Digging into Language Resources | Transcript | Mummies Home Editor's Picks | Previous Sites | Join Us/E-mail | TV/Web Schedule About NOVA | Teachers | Site Map | Shop | Jobs | Search | To print PBS Online | NOVA Online | WGBH © | Updated October 2000 |