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1991 in science
English
1991 en science
French
1991 במדע
HE
1991 a tudományban
Hungarian
Науката во 1991 година
Macedonian
Vitskap i 1991
NN
Vitenskapsåret 1991
NB
1991 na ciência
Portuguese
1991 год в науке
Russian
Vetenskapsåret 1991
Swedish
1991 w nauce
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