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1980
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28
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0
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1980
0
23
0
0
book part
1980
0
19
0
0
book part
1980
0
24
0
0
book
1976
UNESCO
0
30
0
0
book
1975
UNESCO/Payot
0
30
0
0
article
1986
0
23
0
0
article
1986
0
23
0
0