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Title: This is superceded by a newer version, and is FREE
Review: The latest version of this PAMPHLET is 8714r, and was produced in 1977 by the U.S. Bureau of Mines from the work of Broadhead and Heady. It is FREE, available online from the government (yeah, the Pueblo Colorado people), or can be downloaded free online. I only know this because while looking for a KINDLE version, I found that there are people CHARGING for this free government document, which is quite-wrong.
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