Greg Steckel wrote:
...However, the best source I have found for detail information on Kototama is in the book 'Inochi' that was written by Masahilo Nakazono. This is an extremely fascinating book and goes into more detail than Gleason's book and it does include guidance for the actual practice of Kototama, it also includes sound charts...Greg Steckel
The book is produced by the folks at www.kototamabooks.com
They sell other works by Nakazono Sensei, an aikido teacher and student of the founder.