New paper on "Rock fall simulation at Timpanogos Cave National Monument, American Fork Canyon, Utah, USA" published in the journal Landslides is now available on line.
Harp E.L., Dart R.L., Reichenbach P. (2011) Rock fall simulation at Timpanogos Cave National Monument, American Fork Canyon, Utah, USA. Landslides, doi: 10.1007/s10346-010-0251-7.
Available here (log in required): http://geomorphology.irpi.cnr.it/publications/repository/private/journals/2011/Rockfallsimulation_TimpanogosCaveNational.pdf/