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81Published 1968“...Dept. of Scientific and Industrial Research,...”
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82Published 1969“...Dept. of Scientific and Industrial Research,...”
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83Published 1969“...Dept. of Scientific and Industrial Research,...”
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84Published 1969“...Dept. of Scientific and Industrial Research,...”
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85
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86Published 1947“...Dept. of Scientific and Industrial Research,...”
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87Published 1947“...Dept. of Scientific and Industrial Research,...”
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88
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89Published 1990“...Dept. of Scientific and Industrial Research,...”
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90
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91Published 1960“...Dept. of Scientific and Industrial Research,...”
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92Published 1964“...Dept. of Scientific and Industrial Research,...”
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93Published 1962“...Dept. of Scientific and Industrial Research,...”
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94
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95Published 1964“...Dept. of Scientific and Industrial Research,...”
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96Published 1960“...Dept. of Scientific and Industrial Research,...”
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97Published 1961“...Dept. of Scientific and Industrial Research,...”
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98
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99by Speden, I. G. (Ian Gordon), 1932-“...Dept. of Scientific and Industrial Research,...”
Published 1971
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100