BP preservationeer appears in APT Bulletin vol XXX no.2-3. _Restoring the
Minton Tile Ceiling, Bethesda Terrace Arcade, Central Park, New York City_,
co-author Mark Rabinowitz. I leave it to Mark to illuminate BP further.

Another article _Digital Vector Data and Heritage Applications: Development,
Usage, and Current Status_, by Christopher Gray, in the same issue, does not
appear to be writ by the REAL Christopher Gray. Passages such as the
following do not have quite the human-interest flavor, "The site survey was
carried out in a week using a Zeiss Jena SMK-120 metric camera, controlled by
angular measurements of targets applied temporarily to the surfaces measured
in X, Y, and Z, with a 3-second theodolite with edm (electronic distance
measurements)."

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