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	1.	Simplified signs. Volume 1, Principles, background, and application : a manual sign-communication system for special populations / John D. Bonvillian [and three others] ; illustrated by Val Nelson-Metlay. by Bonvillian, John D [author.] Nelson-Metlay, Val [illustrator.] Material type: Text; Format: available online ; Literary form: Not fiction Publisher: Cambridge, England : Open Book Publishers, [2020]Copyright date: 2020 Online resources: Click to View Availability: No items available. Save to lists Add to cart (remove)
	2.	Simplified signs. Volume 2, Simplified sign lexicon, descriptions, and memory aids : a manual sign-communication system for special populations / John D. Bonvillian [and three others] ; illustrated by Val Nelson-Metlay. by Bonvillian, John D [author.] Nelson-Metlay, Val [illustrator.] Material type: Text; Format: available online ; Literary form: Not fiction Publisher: Cambridge, England : OpenBook Publishers, [2020]Copyright date: 2020 Online resources: Click to View Availability: No items available. Save to lists Add to cart (remove)

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