Unusual July 10, 1996, rock fall at Happy Isles, Yosemite National Park, California - Wieczorek, G.; Snyder, J.B.; Waitt, R. B.; Morrissey, M.M.; Uhrhammer, R.; Harp, E.; Norris, R.D.; Bursik, M.I.; Finewood, L.G. (Geological Society of America Bulletin, 2000)