Centro Vasco de Arquitectura
Euskal Herriko Arkitektura Ikerkundea
http://aehistory.wordpress.com/1893/10/08/1893-ho-o-den/
http://www.ndl.go.jp/exposition/e/data/R/208r.html
http://ecuip.lib.uchicago.edu/diglib/social/worldsfair_1893/gallery/images/08-14_japan.jpg
http://www.baxleystamps.com/litho/ogawa/ogawa_hooden.shtml