https://archive.artic.edu/ryerson/2115

Equitable Building

https://upload.wikimedia.org/wikipedia/commons/thumb/9/98/Equitable_Building_%28Manhattan%29.jpg/338px-Equitable_Building_%28Manhattan%29.jpg

http://en.wikipedia.org/wiki/Ernest_R._Graham_(architect)

http://architectureintheloop.blogspot.com.es/p/gapw.html