List of F4 tornadoes (1960–1969)
This is a list of tornadoes which have been officially or unofficially labeled as F4 in the 1960s. The Fujita scale attempts to estimate the intensity of a tornado by classifying the damage caused to natural features and man-made structures in the tornado's path.
Source: Wikipedia — List of F4 tornadoes (1960–1969) (CC BY-SA 4.0)