In June 1982 Geophysics, the correct authors of “The use of vertical seismic profiles in seismic investigations of the earth” are A. H. Balch, M. W. Lee, J. J. Miller, and R. T. Ryder. R. T. Ryder was incorrectly listed as R. T. Taylor on the cover.

The first two sentences of the caption for Figure 17 of the above paper (p. 917) should read “First Leo sand reflections and Minnekahta reflections from two wells in the eastern Powder River basin, Wyoming, from vertical seismic profiles (a) 50 ft thick Leo section, (b) Leo section 10 ft thick or less. Note the reduced relative amplitude of the Leo in (b).”

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