This book is called, The Circus : 1870's—1950s, by Noel Daniel. Published by Taschen, with text in English, French and German. Its huge! While some images are unsettling — like the dancing bears — it contains a fascinating, historical look at an industry of entertainment like no other.
I was extremely lucky to have received this book as a surprise gift after completing The Traveling Circus window at Craft Victoria earlier this year. Amazing right?! I know!! Each time I look through it's pages I discover new things. The layers of detail in the photos are captivating.