 The 1950s saw more expeditions, not only to New Guinea, but also to Nepal and the West Indies.New Guinea, and especially its birds-of-paradise and bowerbirds, kept drawing him back, and he led a total of five expeditions there, his final one in 1964.In addition to numerous papers in the scientific publications of the AMNH, he wrote many illustrated articles for "Natural History" and the "National Geographic Magazine".