by North Carolina State University. Dept. of Engineering Research

1927

by North Carolina State University. Department of Engineering Research

1929

by North Carolina State University. Dept. of Engineering Research

1928

by North Carolina Board of Science and Technology and National Research Council

1999 · National Academies Press

by North Carolina State University

1927

by North Carolina State University. Graduate School

1929

by University of North Carolina (1793-1962).

1927

by North Carolina College for Women, University of North Carolina at Greensboro, Woman's College of the University of North Carolina

1930

by University of North Carolina at Chapel Hill

1915

by North Carolina. Dept. of Conservation and Development

1927

by North Carolina State College. Engineering Experiment Station

1927

by North Carolina State Library

1924