Final answer:
The world's largest collection of materials documenting the language and culture of deaf people can be found at the Gallaudet University Library and Archives.
Step-by-step explanation:
The world's largest collection of materials documenting the language and culture of deaf people can be found at the Gallaudet University Library and Archives. Gallaudet University is a renowned institution for the Deaf and Hard of Hearing, and its library and archives serve as a significant resource for studying and understanding deaf culture and history.