Authors: Brown, J. B. --- Frear, D. E. H. --- Dawson, J. E. --- Guerrant, N. B. --- Hauser, E. A. --- et al. Hoagland, D. R. --- Jeffries, C. D. --- Krahl, M. E. --- Lisse, M. W. --- Loosli, J. K. --- Popp, Hans W. --- Potter, V. R. --- Pritham, G. H. --- Schlenker, F. S. --- Schneider, B. H. --- Somers, G. F. --- Stauffer, J. F. --- Stevens, C. M. --- Stout, P. R. --- van Overbeek, J. --- Voris, L. --- Wolfrom, M. L. --- Zscheile, F. P.
Year: 1950 Publisher: Toronto, New York, London : D. Van Nostrand Company,