P. A. Bovet, _El Problema de los Medanos en el Pais_ (Buenos Aires, 1910). R. Velasco, "Los Medanos de la Provincia de Cordoba" (_Bol. Dep. Gen. Agric. y Ganaderia_, Prov. Cordoba, i, pp. 155-173). Among descriptions of an economic character, which are generally of poor value, we must make an exception in favour of Emile Daireaux, _La vie et les moeurs a la Plata_ (Paris, 1889). A few useful notes on colonization will be found in Teod. Morsbah, "Estudios economicos sobre el Sud de la Provincia de Buenos Aires" (_Bol. Inst. Geog. Argent._, ix, 1888, pp. 143-151) and in E. Segui, "La provincia de Buenos Aires" (_Bol. Inst. Geog. Argent._, xix, 1898, pp. 419-440). A very useful summary of the results of a general inquiry into agriculture will be found in "Investigacion agricola en la Rep. argent." (_Anales Min. Agric. Agronomia_, vol. i, No. 1, 2 and 3, Buenos Aires, 1904: "Preliminares," by Carlos D. Girola, "Investigacion agricola en la region septentrional de la Provincia de Buenos Aires," by Ricardo J. Huergo, and "Investigacion agricola en la Provincia de Santa Fe," by Hugo Miatello). With this inquiry is associated G. D. Girola, _El cultivo del trigo en la provincia de Buenos Aires_ (Buenos Aires, 1904). Agricultural censuses have been taken repeatedly. For 1888 F. Latzina, _L'agriculture et le betail dans la Republique argentine_ (Paris, 1889). For 1895 (_Secundo censo_, see Population) the results are given in C. P. Salas, _Bureau central de Statistique de la province de Buenos Aires_ and _L'agriculture, l'elevage, et le commerce dans la province en 1895_ (La Plata, 1897; maps by Delachaux). For 1908, _Censo agro-pecuario nacional_. _La ganaderia y la agricultura en 1908_ (Buenos Aires, 3 vols. quarto, 1909). Vol. iii contains a series of monographs dealing not only with the Pampean region, but the economic history of the whole country. For 1914 (_Tercer censo_, see Population) the publication of vol. v, relating to agriculture, is unfortunately delayed. There is also available a census of cattle made in 1915 for the Buenos Aires province, _Provincia de Buenos Aires, Min. Obras Publicas, Censo Ganadero_ (1916). 10. THE RAILWAYS. For the history of the railways see Rebuelto, "Historia del desarollo de los ferrocarriles argentinas" (_Bol. Obras Publicas_, vol. v, 1911, pp. 113-172, vol. vi, 1913, pp. 1-48 and 81-110, and vol. viii, 1913, pp. 1-32), and the entire series of the _Boletin de Obras Publicas_. A sort of annual of the Argentine railways has been published every year since 1906 under the title _Killik's Argentine Railway Manual_ (London, 1 vol. with map, last issue 1918). 11. THE PARANA. E. A. S. Delachaux, "Los problemas geograficos del territorio Argentino" (_Rev. Univ. Buenos Aires_, 1906, v), includes a study of the floods of the Parana.