[mapserver-users] Projection Question

[Kieran J. Ames]

Hi, list.
I have a question about how to properly reference some tiff files.
I currently have some tif files (Long Island, NY) that is NAD27. I use
the following lines in my map file:
PROJECTION
 "proj=utm"
 "ellps=clrk66"
 "zone=18"
 "north"
 "no_defs"
END
Now, I have some new tif files for Massachusetts. They are in NAD83.
What values would I use to properly get to them?
Thanks much.
Kieran