Roma Tre Discovery
Opac SBN
Kubikat
The British Library
The Getty Foundation
Bank of England, Soane. 3D competition “Project Soane”
https://www.bl.uk/collection-items/dickinsons-comprehensive-pictures-of-the-great-exhibition-of-1851
http://www.encyclopedia.chicagohistory.org
http://afterburnham.com/daniel-burnham-2/