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Traces the changing theories about continental drift due to the advances in seismology and experimental studies of the behavior of rocks under high pressure. Continental stability was the prevailing scientific view until the late 1960s, when geologists throughout the world became convinced that crustal plates, both continental and oceanic, have moved over many degrees of latitude and longitude since the Cretaceous period.
1919/28 cumulation includes material previously issued in the 1919/20-1935/36 issues and also material not published separately for 1927/28. 1929/39 cumulation includes material previously issued in the 1929/30-1935/36 issues and also material for 1937-39 not published separately.