| 31. | The gardening reference books I owned had no mention of it.
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| 32. | Reference books say the soil should never be allowed to dry out completely.
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| 33. | The Web is ideal for reference books, which go out of date quickly.
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| 34. | Old school magazines, reference books and other main documents were destroyed.
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| 35. | He coauthored a reference book on the mathematics of index numbers.
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| 36. | She looked up the antifungal pills Robert was taking in a reference book.
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| 37. | Macmillan publishes reference books for high school, college and public libraries.
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| 38. | In addition, there is a list of 9 architectural reference books.
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| 39. | Typically, the titles in this series are intended as reference books.
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| 40. | Ji is not listed in official Chinese government directories or biographical reference books.
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