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  • Photographs taken in Arizona, California, Georgia, Nebraska, Colorado and Washington with detailed captions of different kinds of American irrigation techniques : flood irrigation, furrow, irrigation, sprinklers, center pivot, linear move and drip
  • The A. assesses the degree of change in the Buenavista paramo dominated by dwarf bamboo, evergreen shrubs and herbs. Early written descriptions are contrasted with modern observations and repeat photography taken between 1949 and 1985 show
  • Auto parts manufacturing in the USA has been especially attracted to small communities in the Midwest| more recently, they have taken advantage of low labor costs by setting up factories along the border in Mexico. - (DWG)
  • 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)
  • At least two ages of fan deposits occur in the study area. The last episode of deposition may have taken place after climatic amelioration at the end of the Wisconsin, when increased precipitation and an abundance of frost-produced debris at higher