540 Y Young, Leona Esther, 1895- General chemistry, a fist course, by L. E. Young … and C. W. Porter … Rev. ed. New York, Prentice-Hall, inc., 1943. ix, 527 p. col, front., ilus. Diafrs. 23½ cm. [Prentice-Hall chemistry series, W.M.Latimer … editor] Tables en lining-papers. ´´First printing´´