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  • The historical cartography of Scotland. A guide to the literature of Scottish maps and mapping prior to the Ordnance Survey
  • 1991
  • Racial segregation was instituted at the foundation of East London and modified thereafter. Thus prior to the enactment of the Group Areas Act the city was highly segregated. - (AJC)
  • 1991
  • Britain proclaimed a Protectorate over Papua in 1884 and in 1888 annexed it as a Crown Colony. In 1895, gold was discovered, and mining accounted for the overwhelming proportion of mineral activity prior to the First World War. The fields were
  • 1991
  • mechanisms for the rockslide activity appear to have been heavy precipitation prior to the event and the decrease of buttressing mass at the base of the valley wall resulting from recession of the glacier (decrease in width and thickness).
  • 1991
  • The dispersal of cluster bedforms is examined in a short, partially braided reach of the River Quoich, northeast Scotland, after minor flood events in 1989 and 1990. In all cases, the eventual dispersal of clusters occurred without prior removal
  • 1991