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1Published 1981Subjects: “...Geography Research Congresses....”
Conference Proceeding Book -
2Published 1983Subjects: “...Geography Research Congresses....”
Conference Proceeding Book -
3Published 1988Subjects: “...Engineering Research Congresses....”
Conference Proceeding Book -
4Published 1984“...Latin America Economic conditions Research Congresses....”
Conference Proceeding Book