Answers are grounded in this paper and cite their sources.
I. Statement of the problem, 232. — II. The evidence from some previous studies, 233. — III. The “.6 factor” rule and its application, 234. — IV. Specific evidence in a selection of metal processing and chemical industries, 236. — V. Studies of selected mineral industries, 239. — VI. Conclusions, 242.
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Frederick T. Moore (1959) studied this question.
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