| 21. | Inappropriate extraction methods were resulting in trees dying, so by the 1990s the Indian forestry department had banned extraction.
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| 22. | On careful reading of Ge Hong's description they changed their extraction method of using fresh leaves under low temperature.
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| 23. | Further research is needed for environmentally friendly extraction methods, and the availability of this technology in Nepal is necessary.
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| 24. | By 1853, most of the easily mined gold had been exhausted, and hydraulic mining operations became the dominant extraction method.
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| 25. | Omega also is involved in coal bed methane production in Montana, an extraction method that is opposed by environmental groups.
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| 26. | Land said that when his company cleans a carpet it uses a combination of the rotary-shampoo method and the hot-water-extraction method.
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| 27. | He performs hundreds of late abortions every year and has doubts about the safety of the intact dilation and extraction method.
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| 28. | With the dry-extraction method, on the other hand, a powdered detergent compound is brushed into the carpet with specially designed machines.
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| 29. | The Data Transform Layer then employs signal processing tools and feature extraction methods to convert the raw data into useful information.
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| 30. | There are many environmental hazards associated with this extraction method, largely due to the high acute toxicity of the cyanide compounds involved.
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