Circus horse girls

Was inspired to do a drawing about circus horseback riding girls, and came across some awesome reference pictures I HAD to share...

1908, people! I love it! (From Shorpy.com - great vintage photos )

Following two 1890 posters from http://www.imageenvision.com 

From The Golden Circus by Kathryn Jackson, illustrated by Alice and Martin Provensen

(image from flickr )