Eighth International Conference of the International Committee for Bird Preservation, Uppsala, 8-10 Jun 1950; Tenth International Ornithological Congress, Uppsala, Sweden, 10-17 Jun 1950.

Nicholson attended both conferences and gave a paper entitled 'Birds of the North Atlantic' on 16th Jun.

Typescript draft of Nicholson's paper with manuscript revisions; corrected proof and reprint of the published paper; Congress preliminary programme; small typewritten booklet of itineraries for pre-IOC Congress excursions, with the signatures of a number of participating ornithologists at front and back.