Chicago Board of Trade photos 1905

The Library of Congress has a lot of great historical resources and in their collection are the following photos of the Chicago Board of Trade in 1905 pictured during and after trading in the second photo.  You'll have to clink on the links to enlarge the photos for better detail but even better is to click on the Library of Congress links below because they have higher resolution versions you can download, I strongly recommend downloading the 20mb file of the second photo to see the amazing detail of the trading room. 

library of congress source link

library of congress source link