[Proj] ESRI proj codes

[Irwin Scollar]

The NAD directory of proj4 contains the files esri and esri-other 
with additional codes numbered above 100000.

These useful additional codes are not recognized by the EPSG web site 
http://www.epsg-registry.org/. They are also not in the official 
Access database file EPSG_v7_9.mdb.   They are however linked on the 
http://spatialreference.org/ref/epsg/ site.

Is there an Internet source for the latest ESRI data which can be 
used to create a supplementary table for the EPSG Access database and 
which can be updated when ESRI or EPSG adds or changes something?

Irwin Scollar