P.S. our bookstores aren't great for aikido books. On amazon.uk is:
No reviews yet (pretty cheap as well, under £16) - even cheaper in US at $16.47
On amazon USA
Dang sounds like a very proficient and experienced martial artist.
P.S. I recommend to the authors to include the 'search inside' option for both UK and US amazon stores. - I've bought many books on amazon based on the quality of writing in the first chapter and on the contents/index.