This is the second supplement to the original Index published in the October 1944 issue of Geophysics, the first supplement appearing in the October 1946 issue. Information is listed on 239 velocity surveys, most of which were shot in the years 1946, 1947, and 1948. A considerable number of foreign wells are included. Corrections and information missing on some of the surveys of the original Index and the 1946 supplement are tabulated.

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