Nicholson's first destination was Seattle where he attended the International Biological Programme 5th General Assembly, University of Washington, 30 Aug-7 Sep. He then participated in the International Union for the Conservation of Nature and Natural Resources Conference in Banff, Alberta, Canada (dates not precisely known but between the 8th and 17th September), followed by the Second World Conference on National Parks at the Yellowstone and Grand Teton National Parks, Wyoming, USA, 18-27 September. He also spent a short time in New York before returning to the UK.

Correspondence etc related to arrangements and one letter arising.