here is my revised best guessed position
http://www.topozone.com/map.asp?lat=32.06898&lon=-93.76212&size=l&u=4&datum=nad27&layer=DRG
for most sensible available 
notional 1806esesusus2lalatxtx1819 tripoint
it is based on a still more fastidiously plotted 
neutral ground closing line 
made this morning with the new google earth software
update
the closing line is shown in the attachment 
crossing the sabine red watershed divide at the de
soto airport
as marked by the pushpin
a happy coincidence to report also
the proposed western terminal of this line
at the sabine crossing of the 32nd parallel
which i detailed last night 
just happens to fall in a fairly stable looking reach
of river bed
based on the satpic evidence
so the probability seems actually quite high
that we have a very tight fix on the actual location
of this point as it was during the effective period
between 1806 & 1819
& this brings the proposed western terminus position
up to an even higher standard of sensibility than the
proposed eastern one
as also detailed last night
& where does all this leave us
i would say within 100 meters 
or perhaps even within 10 meters 
of best available stretch of the truth on lalatxtx
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