Plains Indian Sign Language is a remarkable pidgin sign language devised by hearing Native Americans in order to communicate cross-tribally.
There have never been native signers of this language, but it is still used as a second language for storytelling purposes among many of the Plains Indian tribes.
Wiyuta Assiniboine Storytelling
Brenda Farnell's wonderful CD-ROM recording of stories being told in Nakota and Plains Indian Sign Talk, with English translation.
Indian Sign Language
Book for sale presenting history, translations, and dialectology of Plains Sign Talk