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- [21] GUIDE TO AGRICULTURAL INFORMATION-SOURCES IN ASIA AND OCEANIA - LEVICK,GRT INTERNATIONAL FORUM ON INFORMATION AND DOCUMENTATION, 1981, 6 (02): : 27 - 27
- [22] UNITED-STATES AND CANADIAN BUSINESS AND BANKING INFORMATION-SOURCES LAW LIBRARY JOURNAL, 1977, 70 (04): : 561 - 569