Can anyone point me to resources regarding the architect Hermann von Holst? He took over Frank Lloyd Wright's practice while FLW was in Europe with Mamah Cheney. He also designed at least 29 prairie style substations for Commonwealth Edison. I am especially interested in anything dealing with his time working for ComEd. Thanks.

See these books at Google Books http://books.google.com/

and search: " architect Hermann von Holst "