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On the centerline question--- <br /> <br />http://tcd.tamu.edu/Documents/evolution.stand-alone.pdf <br /> <br />It looks like the "official" change was 1971, which which fits my distant memory, more or less. However, it looks like there may have been variation from state to state before that, so a difinitive answer may be difficult to come up with. <br /> <br />I didn't read this thing word for word, but it has a lot of info... <br />
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