Over the rest of Japanese recorded history, sumo's popularity has changed according to the whims of its rulers and the need for its use as a training tool in periods of civil strife
http://en.wikipedia.org/wiki/Sumo

Amazon.com: Helmut Newton's SUMO: Helmut Newton: Books ... Amazon.com Review Bringing an entirely new slant to the concept of the coffee-table book, SUMO is a suitably enormous ...
http://www.amazon.com/Helmut-Newtons-SUMO-Newton/dp/38228639 ...

MASUMIRIKI'S SUMO SITE. Welcome to Masumiriki's Sumo Site!! Visit Momo Park 's Sumo Shop You'll see variety of Sumo goods for sale and for auction.
http://www.accesscom.com/%7Eabe/sumo.html

A tribute to the twentieth century's most influential, intriguing and controversial photographer. Limited edition of 10,000 copies worldwide, each signed and numbered by Helmut ...
http://www.taschen.com/pages/en/catalogue/photography/all/02 ...