Measurement of abandoned terracing from air photos : Colca Valley, Peru
Almost 61 % of the pre-Hispanic bench terraces built for growing crops in the Colca valley (Department of Arequipa) were no longer in use for agriculture when the air photos were taken in 1974. Yet Peru now imports large quantities of food. - (DWG)
Holocene ethnobotanical and paleoecological record of human impact on vegetation in the Little Tennessee River valley, Tennessee
Human occupation and utilization of plant resources have affected vegetation in the lower Little Tennessee River Valley of East Tennesse for 10,000 yr. Changes in Indian cultures and land use are documented by radiocarbon chronologies, lithic
Pre-hispanic ridged fields of the Casma Valley, Peru
Ridged fields in the Casma Valley on the desert coast of Peru date chiefly to the Late Intermediate Period (circa A. D. 1300 to 1500), although their use might have extended into early colonial times. There are approximately 200 hectares of well
Responses of floods to Holocene climatic change in the Upper Mississippi Valley
Valley watersheds of southwestern Wisconsin. The reconstructed record of floods shows relatively large and persistent (nonrandom) departures from contemporary long-term average flood magnitudes. The flood history indicates climatic changes
Mandenvlechters en Mezcalstokers in Mexico. Het belang van de rurale nijverheid in de bestaansstrategie van huishoudens in de Tlacolula Vallei, Oaxaca. Basket weavers and producers of Mezcal in Mexico. The importance of rural industry
in the livelihood of households in the Valley of Tlacolula, Oaxaca
Développement industriel et croissance urbaine aux Etats-Unis : l'exemple californien de Silicon Valley
California ; Capitalisme ; Croissance urbaine ; Dynamique spatiale ; Développement régional ; Etats-Unis ; Géographie de l'Amérique ; Industrie de pointe ; Pôle d'attraction ; Silicon Valley ; Technologie ; Zonage
à la réussite de la Silicon Valley. Cependant les déséquilibres et contradictions qui se font jour conduisent à réviser le schéma d'ensemble de ce modèle du technopole.
Agriculture ; Besoins en eau ; California ; Central Valley ; Diffusion des innovations ; Etats-Unis ; Géographie de l'Amérique ; Hydraulique agricole ; Irrigation ; Système d'irrigation
Since the late 1970s, an irrigation technology called linear move has been introduced into California's valleys and then elsewhere. In spite of their high cost, these wheeled machines of interconnected pipes are adopted because they require little