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| google scholar books search | 1.77 | 0.9 | 2862 | 27 | 65 |
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| google scholar books search by year | 1.77 | 0.3 | 1824 | 35 | 9 |
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| search google scholar by author | 0.73 | 0.4 | 3933 | 31 | 19 |
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| google scholar search pdf | 0.12 | 0.7 | 3390 | 25 | 25 |
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