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  1. 1
    Published 1989
    “...Pontificiae Academiae Scientiarum scripta varia ;...”
    Conference Proceeding Book
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    Study Week on a Modern Approach to the Protection of the Environment, November 2-7, 1987 /
  2. 2
    Published 1969
    “...Pontificiae Academiae Scientiarum scripta varia ;...”
    Conference Proceeding Book
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    Study week on organic matter and soil fertility. April 22-27, 1968.

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