For those of you in the Massachusetts area, the Addison Gallery at Phillips Academy currently has an exhibit of the albumen photographs taken by O'Sullivan and Bell on the Wheeler survey. Here's a link:

http://www.andover.edu/addison/exhibit.htm

Paul,

I hope you won't mind if I post a pointer to this exhibit in the NE APUG regional group
forum....

Thanks, I'm a big fan of O'Sullivan....

-Bill

Good idea. Should have thought of that myself.