HI Paul,

If this is just a one-off search you can use the EPSG registry at:
http://www.epsg-registry.org/

E.g. for your query you could enter nad83 as the name, Projected CRS
as type, and the coords of a bounding box that include the parallel

You can also do searches within GeoTools.  This page in the users'
guide shows one approach:
http://docs.codehaus.org/display/GEOTDOC/01+CRS+Helper+Class#01CRSHelperClass-SearchingforaCoordinateReferenceSystem

That example uses the CRS helper class and is looking for a single
EPSG code with this statement:
String code = CRS.lookupIdentifier( example, true );

To get the set of call EPSG codes that match your known parameters I
think you would either need to query the local epsg database directly
(e.g. the HSQL database if you are using gt-epsg-hsql module with your
project) or get down and dirty in the referencing API, constructing
IdentifiedObject instances based on your known parameters and
submitting these to the referencing finder classes.  Unfortunately the
CRS helper class doesn't help with that at present. If you need to go
down this track, let us know.

Of course, if we're lucky, someone else here may be able to point to
other, easier approaches.

Michael

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