Projection Problems

I have just digitized a map of the US with state climatic divisions in Arc/Info
and imported it to GRASS. It came across fine, but the map is in a Lambert
projection. My first response was to try and use Arc/Info with the commands
projectdefine or project to get it to recognize the coverage and then
put it out to geographic. We get an error about the map units though. The
coverage has already been transformed to latlong. Any suggestions.

Craig