These can be converted to a tiff file using you're favourite graphics viewing program.
For WINDOWS, try Irfanview (www.irfanview.com).
For LINUX, ImageMagick has a 'convert' tool that's pretty handy, GIMP and XV will do it also.
On with the GEOTIFF creation!
# Dump the geotiff metadata file (in this case, creates map125_3m.geo_meta) # Note that you can use any of the mapsheets (.r4, .sun_315, .8bit, .mos, etc) to # generate the header edhead -dump_geotiff map125_3m.sun_315 # From a normal tiff file of the mapsheet, generate a geotiff using # the metadata file created in the last step geotifcp -g map125_3m.geo_meta map123_3m.tif map123_3m.geo.tif # Get rid of the geotiff metadata file...it's no longer needed rm map125_3m.geo_metaTiff World Files
# Dump the .tfw file... edhead -dump_tfw map125_3m.sun_315 # Gotta make sure to include the .tfw file whenever you give someone the tiff image