----------------------------Original message---------------------------- Hey maps folks, I was going over my new manual for Format Integration Phase 2 and found something which found very confusing. For the 034 field, what the heck is an "Outer ring" and an "Exclusion Ring"?? How about a "g-ring"? Same thing for the 255 field. help Christopher JJ Thiry Map Librarian Colorado School of Mines [log in to unmask] http://www.mines.edu:8080/library/maproom/