by National Research Council (U.S.)

1930

by United States. National Bureau of Standards

1926

by National Brick Manufacturers' Association of the United States of America

1922

by National Association of State Universities and Land-Grant Colleges

1926

by National Association of Wool Manufacturers

1875

by American National Live Stock Association

1899

by National Business Survey Conference

1929

by National Board of Fire Underwriters. Committee on Construction of Buildings

1921

by National Research Council (U.S.). Division of Engineering and Industrial Research

1930

by National Foreign Trade Council

1915

by National Association of Manufacturers (U.S.)

1911

by National Lumber Manufacturers Association

1915