Nicholson participated in a Columbia University Conference on 'International Economic Development' (held in Williamsburg, Va, and New York), delivering a paper titled 'Environment' which was subsequently published in Journal of International Affairs, XXIV:2, 1970. While in New York he also attended the American launch of his book The Environmental Revolution and held discussions with National Educational Television. He appears to have had engagements in other cities.

Correspondence with National Educational Telvision regarding arrangements and arising; manuscript notes headed 'Aid Agencies 17.2.70 Williamsburg'; typescript of Nicholson's Conference paper; list of addresses of contacts in Washington DC, New York, Virginia and other places.