Thanks to the Internet Archive, we have many of the conference proceedings as pdf files. Obviously this is not a complete collection of the early years.
An Organization first known as the National Braille Club was formed in the 1950's. In 1964 the National Braille Club was renamed the National Braille Association.
In the early years this organization influenced the development of the Nemeth Code. See the excerpt from the First Conference on the Nemeth Code.