----------------------------Original message---------------------------- I am in charge of our library's collection of GPO depository maps (except those from Interior.) When I assumed this responsibility, I couldn't find any documentation on what to do with superseded editions of maps, specifically these series: C 55.418/7: NOAA Charts C 55.418/3: Airport Obstruction Charts and Data Sheets C 55.416/9-2 North Pacific Route Charts Our Gov. Docs staff has tried to get an answer from GPO, but they have not answered repeated queries and the maps continue to pile up... So, can those of you at depository libraries let me know what you do with these? Thanks in advance for your help, Sara Memmott Reference & Research Services, Chester Fritz Library University of North Dakota [log in to unmask]