Otto W. Nuttli, William Stauder, Carl Kisslinger; Travel Time Tables For Earthquakes in the Central United States. Seismological Research Letters ; 40 (4): 19–28. doi: https://doi.org/10.1785/gssrl.40.4.19
Travel-time tables for earthquakes occurring in the central United States and recorded in central and eastern North America are presented for distances from 0 to 1000 km. The tables are given for focal depths of 0, 5, 15, 25 and 35 km.