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research paper; investigation | |||
transactions | |||
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research paper | |||
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research paper |
研究论 文 : 15 phrases in 10 subjects |
Agriculture | 2 |
Animal husbandry | 1 |
Aviation | 1 |
Bridge construction | 2 |
Earth sciences | 1 |
Economy | 1 |
General | 4 |
Geophysics | 1 |
Librarianship | 1 |
Measuring instruments | 1 |