duda, s. j. “Regional Seismicity and Seismic Wave Propagation from Records at the Tonto Forest Seismological Observatory, Payson, Arizona”. Annals of Geophysics 18, no. 4 (November 25, 1965): 365–397. Accessed May 18, 2024. https://www.annalsofgeophysics.eu/index.php/annals/article/view/5509.