Hi Frank......welcome to TFF.
WOW! Fascinating subject.
This may (or may not) help: http://www.jstor.org/pss/3103204
Also, have you tried to contact the Japanese Embassy in Washington, DC or the Japanese Consulate in Miami:
Consulate-General of Japan in Miami
(Area served: Florida)
Consulate-General of Japan
Brickell Bay View Centre, Suite 3200
80 SW 8th Street
Miami FL 33130-3047
Maybe their Information Officer could steer you onto some sources either here in the U.S. or in Japan.