International Union of Forest Research Organization = XIX Congrès mondial / Union internationale des instituts de recherches forestières = XIX. Weltkongreß / Internationaler Verband Forstlicher Forschungsanstalten = XIX Congresò Mundial / Unión Internacional de Organizaciones de Investigación Forestal ; Division 1. v. 1 - Report B. -- Canadian IUFRO World Congress Organizing Committee, [1990-1991].