Land Lot corner positions

I have been working on real estate mapping software for quite some
time, but this problem has always vexed me. Most legal descriptions
and survey drawings I've come across use Land Lot corners as an
original point of reference, but in order to combine this information
with other maps, I need an absolute position of these corners. Short
of trying to locate them physically with a GPS receiver (and hoping
the reading is accurate enough), is there any place this information
is cataloged?
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