Diagnosis (1) Development (1) Casualties (1) Observations (1) Observations (1) Glacial lakes (1) Water (1) Rain and rainfall (1) Peasants (1) Hydraulics (1) Fifteenth century (1) Earth (Planet) (1) Corn (1) Chronology, Historical (1) Canals (1) Alfalfa (1) Ability (1) Societies, etc (1) Societies and clubs (1) Sowing (1) Losses (1) Irrigation (1) Water requirements (1) Cronología histórica (1) Siembra (1) Alfalfa (1) Hidráulica (1) Canales (1) Riego (1) Échelle (1)