That is indeed quite nice. Thanks, Tom.
Of course the physics education version of this map has the rivers
dammed up at time 1860, as nothing happens after that. (I'm alluding
to the fact that the standard university intro physics course taken by
engineering and science students contains nothing later than 1860.)
Bruce
On Thu, Aug 30, 2012 at 12:06 PM, Tom Johnson <
[hidden email]> wrote:
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