Aswynn's book Leaves of Yggdrasil (1990) has had significant influence on the practice of Germanic neopaganism on an international level. A large part of the book is devoted to "feminine mysteries". The book was revised and republished in 1998 as Northern Mysteries and Magick, accompanied by a CD with recordings of Aswynn's incantations, inspired by poems from the Poetic Edda.
