U.S. Geological Survey Crustal Studies Technical Letter Number 16
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Healy, J.H., 1964, Variations in regional traveltimes: U.S. Geological Survey Crustal Studies Technical Letter Number 16, 21 p. (Available at https://pubs.usgs.gov/misc/tl/0016/.)
Abstract
Introduction
Variations in Traveltime
Recommendations
References Cited