by International Garden Cities Town-Planning Association. Conference

1922

by International City Managers' Association

1925

by Permanent International Association of Road Congresses

1923

by Permanent International Association of Road Congresses

1924

by United States. Department of State. Office of International Conferences

1952

by International Council of Women

1930

by International Federation for Housing and Town Planning. Congress

1925

by International Federation for Housing and Planning

1924

by Institute of International Education (New York, N.Y.)

1923

by International Federation for Housing and Planning. Congress

1929

by International Federation for Housing and Planning. 12th congress, Rome

1929

by International Federation for Housing and Planning. Congress

1926