mosaics

I'm interested in patching together a large mosaic of 8 MSS images in
3 paths. Question: will I be better off georeferencing each image
independently, then patching, or should I match up the images first,
then attempt to georefernce the whole mosaic? All things being equal,
I would prefer a method requiring the least labor :-), but my main
concern is how one procedure or the other will affect the accuracy of
the resulting mosaic. Does anyone out there have experience with
a similar problem?

Neel Smith
Bowdoin College
nsmith@polar.bowdoin.edu