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...en all the layers were finished, they were combined into one image using a large process camera. Once colour printing came in, the layers idea was also used CGIS lasted into the 1990s and built a large digital land resource database in Canada. It was developed as a mainframe-b

...statements), has extensible data types, operators, and indexes, and has a large number of extensions written by third parties. ...ishers |booktitle=Proceedings of the 13th International Conference on Very Large Data Bases |format=PDF |location=Brighton, England |isbn=0-934613-46-X |pag