Argentina -almost 3 million km2- is linked economically, socially and politically to the rural production and trade. First, it was linked through livestock (jerky, fat, and leather), and by the end of nineteenth century through extensive agriculture, joined to rail expansion and massive...

IThis article: a) analyzes the evolution of biological innovations in wheat varieties from the middle of nineteenth century to the end of twentieth century, in Britain, France, Spain and Italy, and b) shows that when we consider that aspect of the technological changes in agriculture, it...

This article analyzes the change in the geographic valley of Cauca river landscape between 1870 and 1950, from genealogic point of view, considering it around the present problems. First, a reconstruction of landscape is done, considering the perception of regional writers of the ninetieth and...