Centro Vasco de Arquitectura
Euskal Herriko Arkitektura Ikerkundea
http://roeblingmuseum.org/about-us/washington-a-roebling/
http://www.biography.com/imported/images/Biography/Images/Profiles/R/Washington-Roebling-283628-1-402.jpg
http://en.wikipedia.org/wiki/Washington_Roebling#mediaviewer/File:Brooklyn_Museum_-_Portrait_of_Washington_A._Roebling_-_Th%C3%A9obald_Chartran.jpg
http://upload.wikimedia.org/wikipedia/commons/thumb/2/25/Brooklyn_Museum_-_Portrait_of_Washington_A._Roebling_-_Th%C3%A9obald_Chartran.jpg/220px-Brooklyn_Museum_-_Portrait_of_Washington_A._Roebling_-_Th%C3%A9obald_Chartran.jpg
http://en.wikipedia.org/wiki/Washington_Roebling
http://upload.wikimedia.org/wikipedia/commons/9/93/WashingtonAugustusRoebling.jpg
http://en.wikipedia.org/wiki/Washington_Roebling#mediaviewer/File:WashingtonAugustusRoebling.jpg
http://img4.fold3.com/img/thumbnail/61400154/400/400/0_0_228_295.jpg
http://images.fineartamerica.com/images-medium-large/1-washington-roebling-granger.jpg
http://www.uh.edu/engines/washrob.gif
http://www.lifework-in-bridge-building.com/wpimages/wp15857bcb_1b.jpg