Collection of historical information on a range of mountains of Sierra Nevada. First we dive in ancient uses maps , land registry and other documentary sources to learn how vegetation cover was Sierra Nevada in recent history . But knowing the appearance of the landscape is only part of the story . It is also essential to know how that landscape is used. To do collect information on historical exploitations in our mountains, acorns , wood, mushrooms, honey , etc. Finally we will make an effort to try to learn more about how the climate of Sierra Nevada was in the past. We collect climatic series of schools , municipalities and other diffuse sources.