| 21. | People can come in and use the books and papers.
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| 22. | Shulgin published many of these objective and subjective reports in his books and papers.
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| 23. | He has published numerous books and papers on Vocabulary acquisition.
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| 24. | Its fall-front panel closes vertically, to conceal books and papers.
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| 25. | She has worked with others in the discipline to author many books and papers.
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| 26. | Books and papers are strewn everywhere, as though its occupants left suddenly and never returned.
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| 27. | I spent a number of years studying rather esoteric books and papers on the subject.
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| 28. | In all, he published over 150 books and papers.
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| 29. | Freezing books and papers to kill insects is a common preserotein and starch in books.
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| 30. | King was the author of more than 30 professional books and papers, mostly on cardiology.
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