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References
Denise Schmandt-Besserat
The origin of visible language![Open Access Link](images/OAlink.png)
1992
in: Language origin, Dordrecht : Springer
![Open Access Link](images/OAlink.png)
The earliest precursor of writing
1978
Scientific American 240/6
1992
in: Language origin, Dordrecht : Springer
1978
Scientific American 240/6