por Yokel, Felix Y | Mathey, robert G., coaut.Dikkers, Robert D., coaut | E.U.A. National Boreau of Standards.
por Bryson, J. O | Carpenter, E. F., coaut | E.U.A. National Boreau of Standards.
por Marshall, R. D | E.U.A. National Boreau of Standards.
por E.U.A. National Boreau of Standards.