The Lewis Carroll Society of North America was established in 1974.
LCSNA is a not-for-profit organization dedicated to "furthering Carroll studies, increasing accessibility of research materials, and maintaining public awareness of Carroll's contribution to society". The organization meets twice a year, and has an active publications program. The archive contains materials that document the history of the Society, including financial records, correspondence from members, information on Society meetings, and membership rolls.
References
Lewis Carroll Society of North America Wikipedia(Text) CC BY-SA