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Hi Gord
I've seen this dissertation and started reading some of it. My bookmarked copy doesn't have a date that it was written, but judging from the dates of some of the references cited, I think it was written in the 1980s, and a lot of the references were from the 70s. I don't know if things have changed that much in 25 years, except for more people are doing it.
Interesting topic of a dissertation though!
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