During his stay on the island of New Britain from 1960 to 1961, he gathered material for New Britain: A Geomorphological Study in the Continental Drift (1961), which supported Alfred Wegener's then-controversial theory of continental drift. His final expedition to the Sula Islands of Indonesia was cut short for financial reasons.
During his tenure on the island of New Britain from 1960 to 1961, he gathered data for New Britain: A Geomorphological Study in the Continental Drift (1961), which corroborated Wegener's then-debated theory of continental movement. His final excursion to the Sula Islands in Indonesia was abbreviated due to financial limitations.