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Study Week on a Modern Approach to the Protection of the Environment (1987 : Pontificia Academia Scientiarum)
ScienceDirect https://www.sciencedirect.com/science/book/9780080408163
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International Congress on the Human Environment (1975 : Kyoto, Japan)
ScienceDirect http://www.sciencedirect.com/science/book/9780080219486
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