http://www.philadelphia-reflections.com/images/john_roebling.jpg

http://en.wikipedia.org/wiki/John_Augustus_Roebling

http://es.wikipedia.org/wiki/John_Augustus_Roebling#mediaviewer/Archivo:Roebling.jpg

http://upload.wikimedia.org/wikipedia/commons/8/8f/Roebling.jpg

http://www.biography.com/imported/images/Biography/Images/Profiles/A/John-Augustus-Roebling-9461893-1-402.jpg

http://0.tqn.com/d/history1800s/1/0/L/1/-/-/johnroebling-hw.jpg

http://cache2.allpostersimages.com/p/LRG/17/1747/4EM3D00Z/posters/john-augustus-roebling-american-engineer-and-industrialist-born-in-germany.jpg