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61
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62
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63
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64
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65Published 1990“...Great Britain. Department of Energy...”
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66
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67
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68
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69
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70Published 1989“...Great Britain. Department of Energy...”
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71
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72
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73Published 1988“...Great Britain. Department of Energy...”
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74Published 1988“...Great Britain. Department of Energy...”
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75Published 1988“...Great Britain. Department of Energy...”
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76Published 1992“...Great Britain. Department of Energy...”
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77Published 1987“...Great Britain. Department of Energy...”
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78Published 1978“...Great Britain. Department of Energy...”
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79Published 1991“...Great Britain. Department of Energy...”
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