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- [21] 20 YEARS OF INTERNATIONAL CO-OPERATION OF THE GDR AND THE USSR IN THE FIELD OF THE MEAT INDUSTRY FLEISCH, 1983, 37 (04): : 61 - 62
- [22] CO-OPERATION IN THE APPLE INDUSTRY IN CANADA QUARTERLY JOURNAL OF ECONOMICS, 1906, 21 (01): : 136 - 150
- [23] Co-operation necessary for industry to grow New Zealand Journal of Forestry, 2003, 48 (02): : 17 - 19