Round barn, Morton Twp, near Shenandoah, was built by Joseph Shepard Tunnicliff in 1910.
This is the post card photo of the round barn that I purchased on Ebay and that led to my receiving all these wonderful photos.  I've cut out and enlarged the little bit with the writing on it.  The post card has 1910 written on it; I'm uncertain if this is the date of the photo.  We know it's the date the barn was built.
photo from Hunter/Tunnicliff Photo Album: Merrily Tunnicliff