Of more recent works we must especially notice those of the engineers of the Dirección de Minas:—
R. Stappenbeck y F. Reichert, "Informe preliminar relativo a la parte sudeste del Territorio del Chubut" (An. Min. Agric., Sección Geol. Mineral., y Minas, vol. ix, No. 1, Buenos Aires, 1909).
Ricardo Wichmann, various studies of the eastern part of the plateau of the Rio Negro (ibid., xiii, Nos. 1, 3 and 4, Buenos Aires, 1918 and 1919).
A. Windhausen, studies on the Rio Negro and the Neuquen (ibid., x, No. 1, Buenos Aires, 1914). The geological results of Windhausen's work are summarized in articles that appeared in the American Journal of Science (4th series, xlv, 1918, pp. 1-53) and in the Bol. Acad. Nac. Ciencias Córdoba (xxiii, 1918, pp. 97-128 and 319-364).
We must add G. Rivereto, "La valle del Rio Negro" (Bol. Soc. Geologica Ital., xxxi, 1912, pp. 181-237, and xxxii, 1913, pp. 101-142).
B. The Andes.
Numerous articles in the Bol. Inst. Geog. Argent. and the An. Soc. Cient. Argentina, immediately after the military expedition of 1879-1880 (Host, Avé-Lallemant, etc.).
A detailed study of the Andean region was undertaken at the time of the frontier-quarrel between Argentina and Chile, and this led to a number of publications. The work done by the Argentinians under F. P. Moreno is used in Frontera Argentina-Chilena, Memoria presentada al tribunal nombrado por el Gobernio de su Majestad Britanica (London, 1902, 2 vols. quarto, 1 vol. maps, and 1 vol. photographs), and in the Breve Replica a la memoria Chilena (London, 1 vol. quarto, 1902). See a summary of the results in L. Gallois, "Les Andes de Patagonie" (Annales de Géographie, x, 1901, pp. 232-259).
In the Revista and the Anales of the La Plata Museum will be found part of the research made during this period (1897-1900) by Argentine experts; especially the work of Burckhardt and Wehrli on the Neuquen Cordillera. The Chilean work which served as the basis of the Statement presented on behalf of Chile in reply to the Argentine Report (London, 1902, 4 vols. and 2 vols. as appendices) is, on the whole, less valuable.