Petroleum geophysical exploration in the Free World, consisting of seismic, gravity, ground magnetic, and other nonairborne geophysical methods, rose 1.6 percent in 1963 over 1962. This is in contrast to the 10 percent drop between 1961 and 1962. It is the first upswing since 1956 and, however modest, is welcome. It is 30 percent down from the 1956 level. Airborne magnetometer activity rose nominally from 433,473 line-miles in 1962 to 434,943 in 1963.

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