581.968 Can G Cannon, William Austin, 1870- General and physiological features of the vegetation of the more arid portions of Southera Agrica, with notes on the climatic environment. Washington, Carnegie Institution of Washington, 1924 viii, 159 p. ilus., lams., mapas, tablas. 25 cm. (Carnegie Institution of Washington. Publication nº 354) Notas bibliográficas al pie de las páginas.