Start here
http://pubs.usgs.gov/pdf/circular/c930-o.pdf
You'll find info like this usefull when you do the comparison between Blackheath BHR.V and Happy Creek HPY.V These are two of the most important early stage companies in the industry.
Some technical info for the hard core student.
http://webpages.fc.ul.pt/~amateus/Docs/Abstracts/1Borralha1986.pdf
Even more detailed info.
https://www.jstage.jst.go.jp/article/shigenchishitsu1951/35/193/35_193_317/_pdf
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