----------------------------Original message---------------------------- This message is being cross-posted to MAPS-L and GOVDOC-L. We are interested in finding out how other libraries are removing records from their online catalogs for superseded 7 1/2-minute topographic maps (the I 19.81's). Clearly, over the course of years, thousands of these maps "replace" or supersede early editions. According to the GPO's _Superseded List_, libraries may discard the old maps "if revised", but don't the thousands of online records remain? Also, does anyone know when GPO began cataloging 7 1/2-minute topos in OCLC? Please respond to [log in to unmask], not to the list. Thank you! Michael Knes, Map Specialist Cass Hartnett, Documents Librarian Detroit Public Library 5201 Woodward Ave. Detroit, MI 48202 (313) 833-1445