I'm so sorry that I haven't replied to your message sooner. I don't check my messages on Ancestery.Com too often. I would love to see some of the photos you have from Robert Habben. If you could scan a few slides and send the images to me, I could tell if it's my family. I'm pretty sure it is. I would be more than happy to purchase the slides from you if it is.
You can contact me directly at firstname.lastname@example.org
David M. Habben