Thanks to TJBookArts for the lead to Leijonstedt. Check out her site for useful book arts information and links, including her own tutorials.
Warrior Passage, Mia Leijonstedt
"This concertina book consists of double-sided mono prints overlaid with free-hand writing in silver ink and raised abstract symbols in copper dust. The covers of the book are made of two sheets of etched copper with a leather cord."