Kanada
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Kanada milliy tadqiqot kengashi (National Research Council)
5,900 so'm Savatga qo'shish -
Kanada ta’lim tizimi
4,999 so'm Savatga qo'shish -
Jahon qishloq xo’jaligiga umumiy ta’rif
2,900 so'm Savatga qo'shish