U.S. Geological Survey Crustal Studies Technical Letter Number 17
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Jackson W.H., and Healy, J.H., 1964, Preliminary report on some factors affecting shotpoint efficiency: U.S. Geological Survey Crustal Studies Technical Letter Number 17, 23 p. (Available at https://pubs.usgs.gov/misc/tl/0017/.)
Abstract
Introduction
Field Measurements
Shotpoint Evaluation
Summary
References