Who came up with or wrote the 13 principles of belief for the religion of Wicca?

"Seventy three Witches founded the Council of American Witches in 1974. In April of that year, at the Spring Witchmeet in Minneapolis, MN, (1974-APR-11 to 14), they adopted the [principles of belief]. At the time, Wicca and other Neopagan religions were greatly misunderstood in North America. This document helped to set the record straight."