Details: At Great Falls Discovery Center, 2 Avenue A., Turners Falls, Mass. 01376. (413) 863-3221. Greats Falls Discvery Center is open during the summer daily 10 a.m. - 4 p.m. Images will be exhibited in the Great Hall. Robert B. Hallock has been involved with photography for more than thirty years, but during the past ten years he has primarily but not exclusively devoted most of his attention to black and white photography. Visit his website at: http://www-unix.oit.umass.edu/~rbhome/draftmaster.htm (Robert B. Hallock, Department of Physics, Hasbrouck Laboratory University of Massachusets, Amherst, MA 01003)